665134536664 has 32 divisors (see below), whose sum is σ = 1348016120640. Its totient is φ = 305852371200.

The previous prime is 665134536653. The next prime is 665134536697. The reversal of 665134536664 is 466635431566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11771677 + ... + 11828044.

It is an arithmetic number, because the mean of its divisors is an integer number (42125503770).

Almost surely, 2^665134536664 is an apocalyptic number.

It is an amenable number.

665134536664 is an abundant number, since it is smaller than the sum of its proper divisors (682881583976).

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

665134536664 is a wasteful number, since it uses less digits than its factorization.

665134536664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23600011 (or 23600007 counting only the distinct ones).

The product of its digits is 27993600, while the sum is 55.

The spelling of 665134536664 in words is "six hundred sixty-five billion, one hundred thirty-four million, five hundred thirty-six thousand, six hundred sixty-four".