665125507026 has 16 divisors (see below), whose sum is σ = 1478056682400. Its totient is φ = 221708502324.

The previous prime is 665125507009. The next prime is 665125507031. The reversal of 665125507026 is 620705521566.

665125507026 is a `hidden beast` number, since 6 + 6 + 5 + 1 + 2 + 550 + 70 + 26 = 666.

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, 6158569456 + ... + 6158569563.

It is an arithmetic number, because the mean of its divisors is an integer number (92378542650).

Almost surely, 2^665125507026 is an apocalyptic number.

665125507026 is an abundant number, since it is smaller than the sum of its proper divisors (812931175374).

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

665125507026 is a wasteful number, since it uses less digits than its factorization.

665125507026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12317139030 (or 12317139024 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 665125507026 in words is "six hundred sixty-five billion, one hundred twenty-five million, five hundred seven thousand, twenty-six".