646462664064 has 160 divisors (see below), whose sum is σ = 2198700147600. Its totient is φ = 184703597568.

The previous prime is 646462664053. The next prime is 646462664131. The reversal of 646462664064 is 460466264646.

646462664064 is a `hidden beast` number, since 6 + 4 + 6 + 4 + 626 + 6 + 4 + 0 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 646462664064.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4381119 + ... + 4526270.

Almost surely, 2^646462664064 is an apocalyptic number.

646462664064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

646462664064 is an abundant number, since it is smaller than the sum of its proper divisors (1552237483536).

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

646462664064 is an equidigital number, since it uses as much as digits as its factorization.

646462664064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8907422 (or 8907401 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 54.

The spelling of 646462664064 in words is "six hundred forty-six billion, four hundred sixty-two million, six hundred sixty-four thousand, sixty-four".