161365523274 has 20 divisors (see below), whose sum is σ = 361578302514. Its totient is φ = 53788507704.

The previous prime is 161365523269. The next prime is 161365523287. The reversal of 161365523274 is 472325563161.

161365523274 is a `hidden beast` number, since 1 + 61 + 3 + 6 + 552 + 32 + 7 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 145090142649 + 16275380625 = 380907^2 + 127575^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 498041577 + ... + 498041900.

Almost surely, 2^161365523274 is an apocalyptic number.

161365523274 is an abundant number, since it is smaller than the sum of its proper divisors (200212779240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161365523274 is an equidigital number, since it uses as much as digits as its factorization.

161365523274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996083491 (or 996083482 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The spelling of 161365523274 in words is "one hundred sixty-one billion, three hundred sixty-five million, five hundred twenty-three thousand, two hundred seventy-four".