664125663678 has 8 divisors (see below), whose sum is σ = 1328251327368. Its totient is φ = 221375221224.

The previous prime is 664125663659. The next prime is 664125663703. The reversal of 664125663678 is 876366521466.

It is a sphenic number, since it is the product of 3 distinct primes.

664125663678 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55343805301 + ... + 55343805312.

It is an arithmetic number, because the mean of its divisors is an integer number (166031415921).

Almost surely, 2^664125663678 is an apocalyptic number.

664125663678 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

664125663678 is a wasteful number, since it uses less digits than its factorization.

664125663678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110687610618.

The product of its digits is 52254720, while the sum is 60.

The spelling of 664125663678 in words is "six hundred sixty-four billion, one hundred twenty-five million, six hundred sixty-three thousand, six hundred seventy-eight".