30556361621 has 12 divisors (see below), whose sum is σ = 32777934444. Its totient is φ = 28473552000.

The previous prime is 30556361597. The next prime is 30556361653. The reversal of 30556361621 is 12616365503.

It can be written as a sum of positive squares in 2 ways, for example, as 4968840100 + 25587521521 = 70490^2 + 159961^2 .

It is not a de Polignac number, because 30556361621 - 2²⁶ = 30489252757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30556361921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 671780 + ... + 715821.

It is an arithmetic number, because the mean of its divisors is an integer number (2731494537).

Almost surely, 2^30556361621 is an apocalyptic number.

It is an amenable number.

30556361621 is a deficient number, since it is larger than the sum of its proper divisors (2221572823).

30556361621 is a wasteful number, since it uses less digits than its factorization.

30556361621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387700 (or 1387681 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 38.

The spelling of 30556361621 in words is "thirty billion, five hundred fifty-six million, three hundred sixty-one thousand, six hundred twenty-one".