161657577 has 6 divisors (see below), whose sum is σ = 233505402. Its totient is φ = 107771712.

The previous prime is 161657569. The next prime is 161657599. The reversal of 161657577 is 775756161.

161657577 is a `hidden beast` number, since 1 + 6 + 1 + 6 + 575 + 77 = 666.

161657577 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 137804121 + 23853456 = 11739^2 + 4884^2 .

It is not a de Polignac number, because 161657577 - 2³ = 161657569 is a prime.

It is a super-2 number, since 2×161657577² = 52266344403021858, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161657077) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8980968 + ... + 8980985.

It is an arithmetic number, because the mean of its divisors is an integer number (38917567).

Almost surely, 2^161657577 is an apocalyptic number.

It is an amenable number.

161657577 is a deficient number, since it is larger than the sum of its proper divisors (71847825).

161657577 is a wasteful number, since it uses less digits than its factorization.

161657577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17961959 (or 17961956 counting only the distinct ones).

The product of its digits is 308700, while the sum is 45.

The square root of 161657577 is about 12714.4632997229. The cubic root of 161657577 is about 544.7518180946.

The spelling of 161657577 in words is "one hundred sixty-one million, six hundred fifty-seven thousand, five hundred seventy-seven".