664578840664 has 32 divisors (see below), whose sum is σ = 1248411039840. Its totient is φ = 331669728000.

The previous prime is 664578840649. The next prime is 664578840683. The reversal of 664578840664 is 466048875466.

It is a junction number, because it is equal to n+sod(n) for n = 664578840596 and 664578840605.

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, 11107549 + ... + 11167219.

It is an arithmetic number, because the mean of its divisors is an integer number (39012844995).

Almost surely, 2^664578840664 is an apocalyptic number.

It is an amenable number.

664578840664 is a deficient number, since it is larger than the sum of its proper divisors (583832199176).

664578840664 is a wasteful number, since it uses less digits than its factorization.

664578840664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62251 (or 62247 counting only the distinct ones).

The product of its (nonzero) digits is 185794560, while the sum is 64.

The spelling of 664578840664 in words is "six hundred sixty-four billion, five hundred seventy-eight million, eight hundred forty thousand, six hundred sixty-four".