55271993891 has 2 divisors, whose sum is σ = 55271993892. Its totient is φ = 55271993890.

The previous prime is 55271993879. The next prime is 55271993899. The reversal of 55271993891 is 19839917255.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55271993891 - 2¹⁴ = 55271977507 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55271993891.

It is not a weakly prime, because it can be changed into another prime (55271993899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27635996945 + 27635996946.

It is an arithmetic number, because the mean of its divisors is an integer number (27635996946).

Almost surely, 2^55271993891 is an apocalyptic number.

55271993891 is a deficient number, since it is larger than the sum of its proper divisors (1).

55271993891 is an equidigital number, since it uses as much as digits as its factorization.

55271993891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6123600, while the sum is 59.

The spelling of 55271993891 in words is "fifty-five billion, two hundred seventy-one million, nine hundred ninety-three thousand, eight hundred ninety-one".