621412899456 has 192 divisors, whose sum is σ = 1772092365120. Its totient is φ = 192271712256.

The previous prime is 621412899413. The next prime is 621412899479. The reversal of 621412899456 is 654998214126.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×621412899456² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621412899396 and 621412899405.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34778781 + ... + 34796643.

It is an arithmetic number, because the mean of its divisors is an integer number (9229647735).

Almost surely, 2^621412899456 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 621412899456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (886046182560).

621412899456 is an abundant number, since it is smaller than the sum of its proper divisors (1150679465664).

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

621412899456 is a wasteful number, since it uses less digits than its factorization.

621412899456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18043 (or 17958 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 57.

The spelling of 621412899456 in words is "six hundred twenty-one billion, four hundred twelve million, eight hundred ninety-nine thousand, four hundred fifty-six".