621130660920 has 384 divisors, whose sum is σ = 2584814768640. Its totient is φ = 125577630720.

The previous prime is 621130660901. The next prime is 621130660933. The reversal of 621130660920 is 29066031126.

It is a happy number.

621130660920 is a `hidden beast` number, since 6 + 2 + 11 + 30 + 6 + 609 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 722839 + ... + 1328441.

It is an arithmetic number, because the mean of its divisors is an integer number (6731288460).

Almost surely, 2^621130660920 is an apocalyptic number.

621130660920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621130660920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1292407384320).

621130660920 is an abundant number, since it is smaller than the sum of its proper divisors (1963684107720).

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

621130660920 is a wasteful number, since it uses less digits than its factorization.

621130660920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605675 (or 605668 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The spelling of 621130660920 in words is "six hundred twenty-one billion, one hundred thirty million, six hundred sixty thousand, nine hundred twenty".