161573157 has 16 divisors (see below), whose sum is σ = 239863680. Its totient is φ = 107492256.

The previous prime is 161573149. The next prime is 161573189. The reversal of 161573157 is 751375161.

161573157 is a `hidden beast` number, since 1 + 615 + 7 + 31 + 5 + 7 = 666.

It is not a de Polignac number, because 161573157 - 2³ = 161573149 is a prime.

It is a super-2 number, since 2×161573157² = 52211770125893298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161573107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7633 + ... + 19529.

It is an arithmetic number, because the mean of its divisors is an integer number (14991480).

Almost surely, 2^161573157 is an apocalyptic number.

It is an amenable number.

161573157 is a deficient number, since it is larger than the sum of its proper divisors (78290523).

161573157 is a wasteful number, since it uses less digits than its factorization.

161573157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12409 (or 12403 counting only the distinct ones).

The product of its digits is 22050, while the sum is 36.

The square root of 161573157 is about 12711.1430249211. The cubic root of 161573157 is about 544.6569757395.

The spelling of 161573157 in words is "one hundred sixty-one million, five hundred seventy-three thousand, one hundred fifty-seven".