55510605621 has 12 divisors (see below), whose sum is σ = 80184873600. Its totient is φ = 37005737640.

The previous prime is 55510605617. The next prime is 55510605677. The reversal of 55510605621 is 12650601555.

It is not a de Polignac number, because 55510605621 - 2² = 55510605617 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55510605691) 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, 197980 + ... + 387578.

It is an arithmetic number, because the mean of its divisors is an integer number (6682072800).

Almost surely, 2^55510605621 is an apocalyptic number.

It is an amenable number.

55510605621 is a deficient number, since it is larger than the sum of its proper divisors (24674267979).

55510605621 is a wasteful number, since it uses less digits than its factorization.

55510605621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222136 (or 222133 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 55510605621 in words is "fifty-five billion, five hundred ten million, six hundred five thousand, six hundred twenty-one".