55426385921 has 2 divisors, whose sum is σ = 55426385922. Its totient is φ = 55426385920.

The previous prime is 55426385887. The next prime is 55426385969. The reversal of 55426385921 is 12958362455.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50158529521 + 5267856400 = 223961^2 + 72580^2 .

It is a cyclic number.

It is not a de Polignac number, because 55426385921 - 2¹⁸ = 55426123777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55426385921.

It is not a weakly prime, because it can be changed into another prime (55426285921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27713192960 + 27713192961.

It is an arithmetic number, because the mean of its divisors is an integer number (27713192961).

Almost surely, 2^55426385921 is an apocalyptic number.

It is an amenable number.

55426385921 is a deficient number, since it is larger than the sum of its proper divisors (1).

55426385921 is an equidigital number, since it uses as much as digits as its factorization.

55426385921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592000, while the sum is 50.

The spelling of 55426385921 in words is "fifty-five billion, four hundred twenty-six million, three hundred eighty-five thousand, nine hundred twenty-one".