664566332464 has 40 divisors (see below), whose sum is σ = 1344252033792. Its totient is φ = 317677039680.

The previous prime is 664566332453. The next prime is 664566332477. The reversal of 664566332464 is 464233665466.

It is a super-2 number, since 2×664566332464² (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 7 ways as a sum of consecutive naturals, for example, 286309 + ... + 1187899.

Almost surely, 2^664566332464 is an apocalyptic number.

It is an amenable number.

664566332464 is an abundant number, since it is smaller than the sum of its proper divisors (679685701328).

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

664566332464 is a wasteful number, since it uses less digits than its factorization.

664566332464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903625 (or 903619 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 55.

The spelling of 664566332464 in words is "six hundred sixty-four billion, five hundred sixty-six million, three hundred thirty-two thousand, four hundred sixty-four".