161556306 has 16 divisors (see below), whose sum is σ = 323465184. Its totient is φ = 53793344.

The previous prime is 161556299. The next prime is 161556331. The reversal of 161556306 is 603655161.

It is a super-2 number, since 2×161556306² = 52200880016731272, which contains 22 as substring.

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, 8535 + ... + 19898.

It is an arithmetic number, because the mean of its divisors is an integer number (20216574).

Almost surely, 2^161556306 is an apocalyptic number.

161556306 is an abundant number, since it is smaller than the sum of its proper divisors (161908878).

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

161556306 is a wasteful number, since it uses less digits than its factorization.

161556306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29385.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 161556306 is about 12710.4801640221. The cubic root of 161556306 is about 544.6380403875.

The spelling of 161556306 in words is "one hundred sixty-one million, five hundred fifty-six thousand, three hundred six".