621690711532416 has 1280 divisors, whose sum is σ = 2166023132697600. Its totient is φ = 175567498444800.

The previous prime is 621690711532391. The next prime is 621690711532463. The reversal of 621690711532416 is 614235117096126.

621690711532416 is a `hidden beast` number, since 6 + 2 + 1 + 6 + 9 + 0 + 71 + 153 + 2 + 416 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 11630577946 + ... + 11630631398.

It is an arithmetic number, because the mean of its divisors is an integer number (1692205572420).

Almost surely, 2^{621690711532416} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621690711532416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1083011566348800).

621690711532416 is an abundant number, since it is smaller than the sum of its proper divisors (1544332421165184).

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

621690711532416 is a wasteful number, since it uses less digits than its factorization.

621690711532416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53689 (or 53668 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 621690711532416 in words is "six hundred twenty-one trillion, six hundred ninety billion, seven hundred eleven million, five hundred thirty-two thousand, four hundred sixteen".