665214464578968 has 64 divisors (see below), whose sum is σ = 1852207073704800. Its totient is φ = 221211460874880.

The previous prime is 665214464578921. The next prime is 665214464579003. The reversal of 665214464578968 is 869875464412566.

665214464578968 is a `hidden beast` number, since 6 + 6 + 5 + 2 + 1 + 446 + 45 + 78 + 9 + 68 = 666.

It is a congruent number.

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, 3657505971 + ... + 3657687842.

Almost surely, 2^{665214464578968} is an apocalyptic number.

It is an amenable number.

665214464578968 is an abundant number, since it is smaller than the sum of its proper divisors (1186992609125832).

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

665214464578968 is a wasteful number, since it uses less digits than its factorization.

665214464578968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7315194249 (or 7315194239 counting only the distinct ones).

The product of its digits is 16721510400, while the sum is 81.

The spelling of 665214464578968 in words is "six hundred sixty-five trillion, two hundred fourteen billion, four hundred sixty-four million, five hundred seventy-eight thousand, nine hundred sixty-eight".