161565264 has 120 divisors (see below), whose sum is σ = 534668160. Its totient is φ = 44561664.

The previous prime is 161565259. The next prime is 161565277. The reversal of 161565264 is 462565161.

It is a super-2 number, since 2×161565264² = 52206669062779392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26469 + ... + 31995.

It is an arithmetic number, because the mean of its divisors is an integer number (4455568).

Almost surely, 2^161565264 is an apocalyptic number.

161565264 is a gapful number since it is divisible by the number (14) 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 161565264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267334080).

161565264 is an abundant number, since it is smaller than the sum of its proper divisors (373102896).

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

161565264 is a wasteful number, since it uses less digits than its factorization.

161565264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5577 (or 5568 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 161565264 is about 12710.8325455101. The cubic root of 161565264 is about 544.6481065940.

The spelling of 161565264 in words is "one hundred sixty-one million, five hundred sixty-five thousand, two hundred sixty-four".