621344920664 has 32 divisors (see below), whose sum is σ = 1254671418000. Its totient is φ = 286767119232.

The previous prime is 621344920663. The next prime is 621344920687. The reversal of 621344920664 is 466029443126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621344920663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7210022 + ... + 7295690.

Almost surely, 2^621344920664 is an apocalyptic number.

It is an amenable number.

621344920664 is an abundant number, since it is smaller than the sum of its proper divisors (633326497336).

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

621344920664 is a wasteful number, since it uses less digits than its factorization.

621344920664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155427 (or 155423 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 47.

The spelling of 621344920664 in words is "six hundred twenty-one billion, three hundred forty-four million, nine hundred twenty thousand, six hundred sixty-four".