161577807 has 4 divisors (see below), whose sum is σ = 215437080. Its totient is φ = 107718536.

The previous prime is 161577749. The next prime is 161577827. The reversal of 161577807 is 708775161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 708775161 = 3 ⋅236258387.

It is a cyclic number.

It is not a de Polignac number, because 161577807 - 2¹⁰ = 161576783 is a prime.

It is a super-2 number, since 2×161577807² = 52214775429858498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161577827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26929632 + ... + 26929637.

It is an arithmetic number, because the mean of its divisors is an integer number (53859270).

Almost surely, 2^161577807 is an apocalyptic number.

161577807 is a deficient number, since it is larger than the sum of its proper divisors (53859273).

161577807 is an equidigital number, since it uses as much as digits as its factorization.

161577807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53859272.

The product of its (nonzero) digits is 82320, while the sum is 42.

The square root of 161577807 is about 12711.3259339850. The cubic root of 161577807 is about 544.6622006805.

The spelling of 161577807 in words is "one hundred sixty-one million, five hundred seventy-seven thousand, eight hundred seven".