664774685960 has 64 divisors (see below), whose sum is σ = 1864822504320. Its totient is φ = 207202498560.

The previous prime is 664774685929. The next prime is 664774685977. The reversal of 664774685960 is 69586477466.

It is a super-2 number, since 2×664774685960² (a number of 24 digits) contains 22 as substring.

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, 107914889 + ... + 107921048.

It is an arithmetic number, because the mean of its divisors is an integer number (29137851630).

Almost surely, 2^664774685960 is an apocalyptic number.

It is an amenable number.

664774685960 is an abundant number, since it is smaller than the sum of its proper divisors (1200047818360).

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

664774685960 is a wasteful number, since it uses less digits than its factorization.

664774685960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215835966 (or 215835962 counting only the distinct ones).

The product of its (nonzero) digits is 365783040, while the sum is 68.

The spelling of 664774685960 in words is "six hundred sixty-four billion, seven hundred seventy-four million, six hundred eighty-five thousand, nine hundred sixty".