161635264 has 56 divisors (see below), whose sum is σ = 371287040. Its totient is φ = 68380416.

The previous prime is 161635259. The next prime is 161635291. The reversal of 161635264 is 462536161.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×161635264² = 52251917136699392, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33109 + ... + 37675.

Almost surely, 2^161635264 is an apocalyptic number.

161635264 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 161635264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185643520).

161635264 is an abundant number, since it is smaller than the sum of its proper divisors (209651776).

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

161635264 is an equidigital number, since it uses as much as digits as its factorization.

161635264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4665 (or 4655 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 161635264 is about 12713.5858041703. The cubic root of 161635264 is about 544.7267535790.

The spelling of 161635264 in words is "one hundred sixty-one million, six hundred thirty-five thousand, two hundred sixty-four".