55388974391 has 2 divisors, whose sum is σ = 55388974392. Its totient is φ = 55388974390.

The previous prime is 55388974349. The next prime is 55388974423. The reversal of 55388974391 is 19347988355.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55388974391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55388974331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27694487195 + 27694487196.

It is an arithmetic number, because the mean of its divisors is an integer number (27694487196).

Almost surely, 2^55388974391 is an apocalyptic number.

55388974391 is a deficient number, since it is larger than the sum of its proper divisors (1).

55388974391 is an equidigital number, since it uses as much as digits as its factorization.

55388974391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32659200, while the sum is 62.

The spelling of 55388974391 in words is "fifty-five billion, three hundred eighty-eight million, nine hundred seventy-four thousand, three hundred ninety-one".