665161610160 has 80 divisors (see below), whose sum is σ = 2062098526176. Its totient is φ = 177368039424.

The previous prime is 665161610159. The next prime is 665161610177. The reversal of 665161610160 is 61016161566.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6306982 + ... + 6411578.

Almost surely, 2^665161610160 is an apocalyptic number.

665161610160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665161610160 is an abundant number, since it is smaller than the sum of its proper divisors (1396936916016).

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

665161610160 is a wasteful number, since it uses less digits than its factorization.

665161610160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131110 (or 131104 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 665161610160 in words is "six hundred sixty-five billion, one hundred sixty-one million, six hundred ten thousand, one hundred sixty".