665138374292 has 24 divisors (see below), whose sum is σ = 1330347169536. Its totient is φ = 285044213088.

The previous prime is 665138374279. The next prime is 665138374333. The reversal of 665138374292 is 292473831566.

665138374292 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82043 + ... + 1156290.

It is an arithmetic number, because the mean of its divisors is an integer number (55431132064).

Almost surely, 2^665138374292 is an apocalyptic number.

It is an amenable number.

665138374292 is an abundant number, since it is smaller than the sum of its proper divisors (665208795244).

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

665138374292 is a wasteful number, since it uses less digits than its factorization.

665138374292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257527 (or 1257525 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 56.

The spelling of 665138374292 in words is "six hundred sixty-five billion, one hundred thirty-eight million, three hundred seventy-four thousand, two hundred ninety-two".