6400666626664 has 64 divisors (see below), whose sum is σ = 12544554781440. Its totient is φ = 3058685521920.

The previous prime is 6400666626649. The next prime is 6400666626713. The reversal of 6400666626664 is 4666266660046.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6400666626599 and 6400666626608.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72922324 + ... + 73010044.

It is an arithmetic number, because the mean of its divisors is an integer number (196008668460).

Almost surely, 2^{6400666626664} is an apocalyptic number.

It is an amenable number.

6400666626664 is a deficient number, since it is larger than the sum of its proper divisors (6143888154776).

6400666626664 is a wasteful number, since it uses less digits than its factorization.

6400666626664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92330 (or 92326 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 58.

The spelling of 6400666626664 in words is "six trillion, four hundred billion, six hundred sixty-six million, six hundred twenty-six thousand, six hundred sixty-four".