664727077968 has 20 divisors (see below), whose sum is σ = 1717211618208. Its totient is φ = 221575692640.

The previous prime is 664727077961. The next prime is 664727077999. The reversal of 664727077968 is 869770727466.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664727077961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6924240348 + ... + 6924240443.

Almost surely, 2^664727077968 is an apocalyptic number.

It is an amenable number.

664727077968 is an abundant number, since it is smaller than the sum of its proper divisors (1052484540240).

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

664727077968 is a wasteful number, since it uses less digits than its factorization.

664727077968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13848480802 (or 13848480796 counting only the distinct ones).

The product of its (nonzero) digits is 298722816, while the sum is 69.

The spelling of 664727077968 in words is "six hundred sixty-four billion, seven hundred twenty-seven million, seventy-seven thousand, nine hundred sixty-eight".