161656860 has 24 divisors (see below), whose sum is σ = 452639376. Its totient is φ = 43108480.

The previous prime is 161656819. The next prime is 161656871. The reversal of 161656860 is 68656161.

It is a super-2 number, since 2×161656860² = 52265880770119200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1347081 + ... + 1347200.

It is an arithmetic number, because the mean of its divisors is an integer number (18859974).

Almost surely, 2^161656860 is an apocalyptic number.

161656860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161656860 is an abundant number, since it is smaller than the sum of its proper divisors (290982516).

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

161656860 is a wasteful number, since it uses less digits than its factorization.

161656860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694293 (or 2694291 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 161656860 is about 12714.4351034562. The cubic root of 161656860 is about 544.7510127140.

The spelling of 161656860 in words is "one hundred sixty-one million, six hundred fifty-six thousand, eight hundred sixty".