55660607621 has 16 divisors (see below), whose sum is σ = 56740358400. Its totient is φ = 54590329728.

The previous prime is 55660607603. The next prime is 55660607657. The reversal of 55660607621 is 12670606655.

55660607621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-55660607621 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 (55660601621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10156160 + ... + 10161638.

It is an arithmetic number, because the mean of its divisors is an integer number (3546272400).

Almost surely, 2^55660607621 is an apocalyptic number.

It is an amenable number.

55660607621 is a deficient number, since it is larger than the sum of its proper divisors (1079750779).

55660607621 is a wasteful number, since it uses less digits than its factorization.

55660607621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6308.

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 55660607621 in words is "fifty-five billion, six hundred sixty million, six hundred seven thousand, six hundred twenty-one".