665406770875 has 32 divisors (see below), whose sum is σ = 1035338383872. Its totient is φ = 414799020000.

The previous prime is 665406770863. The next prime is 665406770891. The reversal of 665406770875 is 578077604566.

It is not a de Polignac number, because 665406770875 - 2³¹ = 663259287227 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34556961 + ... + 34576210.

It is an arithmetic number, because the mean of its divisors is an integer number (32354324496).

Almost surely, 2^665406770875 is an apocalyptic number.

665406770875 is a deficient number, since it is larger than the sum of its proper divisors (369931612997).

665406770875 is a wasteful number, since it uses less digits than its factorization.

665406770875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69133204 (or 69133194 counting only the distinct ones).

The product of its (nonzero) digits is 59270400, while the sum is 61.

The spelling of 665406770875 in words is "six hundred sixty-five billion, four hundred six million, seven hundred seventy thousand, eight hundred seventy-five".