55451136621 has 16 divisors (see below), whose sum is σ = 74991724544. Its totient is φ = 36442695744.

The previous prime is 55451136581. The next prime is 55451136623. The reversal of 55451136621 is 12663115455.

55451136621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55451136621 - 2⁷ = 55451136493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55451136621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55451136623) 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, 403690 + ... + 523323.

It is an arithmetic number, because the mean of its divisors is an integer number (4686982784).

Almost surely, 2^55451136621 is an apocalyptic number.

It is an amenable number.

55451136621 is a deficient number, since it is larger than the sum of its proper divisors (19540587923).

55451136621 is a wasteful number, since it uses less digits than its factorization.

55451136621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927300.

The product of its digits is 108000, while the sum is 39.

The spelling of 55451136621 in words is "fifty-five billion, four hundred fifty-one million, one hundred thirty-six thousand, six hundred twenty-one".