664388017704 has 48 divisors (see below), whose sum is σ = 1799883777120. Its totient is φ = 221401188000.

The previous prime is 664388017703. The next prime is 664388017721. The reversal of 664388017704 is 407710883466.

664388017704 is a `hidden beast` number, since 66 + 438 + 80 + 1 + 7 + 70 + 4 = 666.

It is a super-2 number, since 2×664388017704² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664388017703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1019422 + ... + 1538829.

It is an arithmetic number, because the mean of its divisors is an integer number (37497578690).

Almost surely, 2^664388017704 is an apocalyptic number.

It is an amenable number.

664388017704 is an abundant number, since it is smaller than the sum of its proper divisors (1135495759416).

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

664388017704 is a wasteful number, since it uses less digits than its factorization.

664388017704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2561870 (or 2561863 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 54.

The spelling of 664388017704 in words is "six hundred sixty-four billion, three hundred eighty-eight million, seventeen thousand, seven hundred four".