664631425184 has 12 divisors (see below), whose sum is σ = 1308493118394. Its totient is φ = 332315712576.

The previous prime is 664631425177. The next prime is 664631425189. The reversal of 664631425184 is 481524136466.

It can be written as a sum of positive squares in only one way, i.e., 663540576400 + 1090848784 = 814580^2 + 33028^2 .

It is a super-2 number, since 2×664631425184² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664631425189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10384865987 + ... + 10384866050.

Almost surely, 2^664631425184 is an apocalyptic number.

It is an amenable number.

664631425184 is a deficient number, since it is larger than the sum of its proper divisors (643861693210).

664631425184 is a wasteful number, since it uses less digits than its factorization.

664631425184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20769732047 (or 20769732039 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 50.

The spelling of 664631425184 in words is "six hundred sixty-four billion, six hundred thirty-one million, four hundred twenty-five thousand, one hundred eighty-four".