664255255128 has 32 divisors (see below), whose sum is σ = 1661224484400. Its totient is φ = 221340238848.

The previous prime is 664255255117. The next prime is 664255255171. The reversal of 664255255128 is 821552552466.

It is a congruent number.

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, 4816813 + ... + 4952796.

Almost surely, 2^664255255128 is an apocalyptic number.

It is an amenable number.

664255255128 is an abundant number, since it is smaller than the sum of its proper divisors (996969229272).

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

664255255128 is a wasteful number, since it uses less digits than its factorization.

664255255128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9772451 (or 9772447 counting only the distinct ones).

The product of its digits is 5760000, while the sum is 51.

The spelling of 664255255128 in words is "six hundred sixty-four billion, two hundred fifty-five million, two hundred fifty-five thousand, one hundred twenty-eight".