161611632 has 160 divisors (see below), whose sum is σ = 571074560. Its totient is φ = 42612480.

The previous prime is 161611607. The next prime is 161611633. The reversal of 161611632 is 236116161.

161611632 is a `hidden beast` number, since 1 + 6 + 16 + 11 + 632 = 666.

It is a super-2 number, since 2×161611632² = 52236639195406848, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 161611596 and 161611605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161611633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37257 + ... + 41367.

It is an arithmetic number, because the mean of its divisors is an integer number (3569216).

Almost surely, 2^161611632 is an apocalyptic number.

161611632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161611632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285537280).

161611632 is an abundant number, since it is smaller than the sum of its proper divisors (409462928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161611632 is a wasteful number, since it uses less digits than its factorization.

161611632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4148 (or 4136 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 161611632 is about 12712.6563707197. The cubic root of 161611632 is about 544.7002048962.

Adding to 161611632 its reverse (236116161), we get a palindrome (397727793).

The spelling of 161611632 in words is "one hundred sixty-one million, six hundred eleven thousand, six hundred thirty-two".