664463621637600 has 144 divisors (see below), whose sum is σ = 2169651895609968. Its totient is φ = 176631338967040.

The previous prime is 664463621637593. The next prime is 664463621637709. The reversal of 664463621637600 is 6736126364466.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 435926649 + ... + 437448248.

It is an arithmetic number, because the mean of its divisors is an integer number (15067027052847).

Almost surely, 2^{664463621637600} is an apocalyptic number.

664463621637600 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664463621637600 is an abundant number, since it is smaller than the sum of its proper divisors (1505188273972368).

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

664463621637600 is a wasteful number, since it uses less digits than its factorization.

664463621637600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873375237 (or 873375224 counting only the distinct ones).

The product of its (nonzero) digits is 94058496, while the sum is 60.

The spelling of 664463621637600 in words is "six hundred sixty-four trillion, four hundred sixty-three billion, six hundred twenty-one million, six hundred thirty-seven thousand, six hundred".