621220056556 has 24 divisors (see below), whose sum is σ = 1255728244176. Its totient is φ = 265762590720.

The previous prime is 621220056551. The next prime is 621220056599. The reversal of 621220056556 is 655650022126.

621220056556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×621220056556² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (621220056551) 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, 415253301 + ... + 415254796.

It is an arithmetic number, because the mean of its divisors is an integer number (52322010174).

Almost surely, 2^621220056556 is an apocalyptic number.

It is an amenable number.

621220056556 is an abundant number, since it is smaller than the sum of its proper divisors (634508187620).

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

621220056556 is a wasteful number, since it uses less digits than its factorization.

621220056556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830508129 (or 830508127 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 621220056556 in words is "six hundred twenty-one billion, two hundred twenty million, fifty-six thousand, five hundred fifty-six".