621166140556344 has 48 divisors (see below), whose sum is σ = 1682420245524720. Its totient is φ = 207043653229440.

The previous prime is 621166140556243. The next prime is 621166140556361. The reversal of 621166140556344 is 443655041661126.

621166140556344 is a `hidden beast` number, since 6 + 2 + 1 + 1 + 6 + 6 + 1 + 40 + 556 + 3 + 44 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 243031452 + ... + 245574059.

It is an arithmetic number, because the mean of its divisors is an integer number (35050421781765).

Almost surely, 2^{621166140556344} is an apocalyptic number.

It is an amenable number.

621166140556344 is an abundant number, since it is smaller than the sum of its proper divisors (1061254104968376).

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

621166140556344 is a wasteful number, since it uses less digits than its factorization.

621166140556344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488623180 (or 488623173 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 54.

The spelling of 621166140556344 in words is "six hundred twenty-one trillion, one hundred sixty-six billion, one hundred forty million, five hundred fifty-six thousand, three hundred forty-four".