161556157 has 8 divisors (see below), whose sum is σ = 184714496. Its totient is φ = 138417552.

The previous prime is 161556089. The next prime is 161556167. The reversal of 161556157 is 751655161.

161556157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161556157 - 2²³ = 153167549 is a prime.

It is a super-2 number, since 2×161556157² = 52200783729217298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161556167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23743 + ... + 29779.

It is an arithmetic number, because the mean of its divisors is an integer number (23089312).

Almost surely, 2^161556157 is an apocalyptic number.

It is an amenable number.

161556157 is a deficient number, since it is larger than the sum of its proper divisors (23158339).

161556157 is an equidigital number, since it uses as much as digits as its factorization.

161556157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9867.

The product of its digits is 31500, while the sum is 37.

The square root of 161556157 is about 12710.4743027159. The cubic root of 161556157 is about 544.6378729514.

The spelling of 161556157 in words is "one hundred sixty-one million, five hundred fifty-six thousand, one hundred fifty-seven".