161560774 has 4 divisors (see below), whose sum is σ = 242341164. Its totient is φ = 80780386.

The previous prime is 161560739. The next prime is 161560807. The reversal of 161560774 is 477065161.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×161560774² = 52203767390958152, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40390192 + ... + 40390195.

It is an arithmetic number, because the mean of its divisors is an integer number (60585291).

Almost surely, 2^161560774 is an apocalyptic number.

161560774 is a deficient number, since it is larger than the sum of its proper divisors (80780390).

161560774 is an equidigital number, since it uses as much as digits as its factorization.

161560774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80780389.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 161560774 is about 12710.6559232795. The cubic root of 161560774 is about 544.6430611764.

The spelling of 161560774 in words is "one hundred sixty-one million, five hundred sixty thousand, seven hundred seventy-four".