161056557 has 12 divisors (see below), whose sum is σ = 242752224. Its totient is φ = 102702600.

The previous prime is 161056549. The next prime is 161056579. The reversal of 161056557 is 755650161.

161056557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161056557 - 2³ = 161056549 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161056537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 388819 + ... + 389232.

It is an arithmetic number, because the mean of its divisors is an integer number (20229352).

Almost surely, 2^161056557 is an apocalyptic number.

It is an amenable number.

161056557 is a deficient number, since it is larger than the sum of its proper divisors (81695667).

161056557 is a wasteful number, since it uses less digits than its factorization.

161056557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778080 (or 778077 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The square root of 161056557 is about 12690.8060027722. The cubic root of 161056557 is about 544.0758763199.

The spelling of 161056557 in words is "one hundred sixty-one million, fifty-six thousand, five hundred fifty-seven".