55123123591 has 2 divisors, whose sum is σ = 55123123592. Its totient is φ = 55123123590.

The previous prime is 55123123547. The next prime is 55123123597. The reversal of 55123123591 is 19532132155.

55123123591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55123123591 - 2²⁵ = 55089569159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55123123591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55123123597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27561561795 + 27561561796.

It is an arithmetic number, because the mean of its divisors is an integer number (27561561796).

Almost surely, 2^55123123591 is an apocalyptic number.

55123123591 is a deficient number, since it is larger than the sum of its proper divisors (1).

55123123591 is an equidigital number, since it uses as much as digits as its factorization.

55123123591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40500, while the sum is 37.

The spelling of 55123123591 in words is "fifty-five billion, one hundred twenty-three million, one hundred twenty-three thousand, five hundred ninety-one".