621366911616 has 256 divisors, whose sum is σ = 1899704793600. Its totient is φ = 177969991680.

The previous prime is 621366911567. The next prime is 621366911623. The reversal of 621366911616 is 616119663126.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35544670 + ... + 35562146.

It is an arithmetic number, because the mean of its divisors is an integer number (7420721850).

Almost surely, 2^621366911616 is an apocalyptic number.

621366911616 is a gapful number since it is divisible by the number (66) 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 621366911616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (949852396800).

621366911616 is an abundant number, since it is smaller than the sum of its proper divisors (1278337881984).

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

621366911616 is a wasteful number, since it uses less digits than its factorization.

621366911616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17967 (or 17955 counting only the distinct ones).

The product of its digits is 419904, while the sum is 48.

The spelling of 621366911616 in words is "six hundred twenty-one billion, three hundred sixty-six million, nine hundred eleven thousand, six hundred sixteen".