664560877455 has 24 divisors (see below), whose sum is σ = 1152217893840. Its totient is φ = 354336353280.

The previous prime is 664560877447. The next prime is 664560877469. The reversal of 664560877455 is 554778065466.

664560877455 is a `hidden beast` number, since 6 + 6 + 45 + 60 + 87 + 7 + 455 = 666.

It is not a de Polignac number, because 664560877455 - 2³ = 664560877447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664560877392 and 664560877401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1834450 + ... + 2166639.

It is an arithmetic number, because the mean of its divisors is an integer number (48009078910).

Almost surely, 2^664560877455 is an apocalyptic number.

664560877455 is a deficient number, since it is larger than the sum of its proper divisors (487657016385).

664560877455 is a wasteful number, since it uses less digits than its factorization.

664560877455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004791 (or 4004788 counting only the distinct ones).

The product of its (nonzero) digits is 169344000, while the sum is 63.

The spelling of 664560877455 in words is "six hundred sixty-four billion, five hundred sixty million, eight hundred seventy-seven thousand, four hundred fifty-five".