55369311621 has 16 divisors (see below), whose sum is σ = 79834560960. Its totient is φ = 33932033280.

The previous prime is 55369311607. The next prime is 55369311659. The reversal of 55369311621 is 12611396355.

It is not a de Polignac number, because 55369311621 - 2¹⁴ = 55369295237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55365311621) 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, 2936091 + ... + 2954888.

It is an arithmetic number, because the mean of its divisors is an integer number (4989660060).

Almost surely, 2^55369311621 is an apocalyptic number.

It is an amenable number.

55369311621 is a deficient number, since it is larger than the sum of its proper divisors (24465249339).

55369311621 is a wasteful number, since it uses less digits than its factorization.

55369311621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5891236.

The product of its digits is 145800, while the sum is 42.

The spelling of 55369311621 in words is "fifty-five billion, three hundred sixty-nine million, three hundred eleven thousand, six hundred twenty-one".