91550722877 has 2 divisors, whose sum is σ = 91550722878. Its totient is φ = 91550722876.

The previous prime is 91550722841. The next prime is 91550722927. The reversal of 91550722877 is 77822705519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84061724356 + 7488998521 = 289934^2 + 86539^2 .

It is a cyclic number.

It is not a de Polignac number, because 91550722877 - 2¹⁸ = 91550460733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91550722817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45775361438 + 45775361439.

It is an arithmetic number, because the mean of its divisors is an integer number (45775361439).

Almost surely, 2^91550722877 is an apocalyptic number.

It is an amenable number.

91550722877 is a deficient number, since it is larger than the sum of its proper divisors (1).

91550722877 is an equidigital number, since it uses as much as digits as its factorization.

91550722877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2469600, while the sum is 53.

The spelling of 91550722877 in words is "ninety-one billion, five hundred fifty million, seven hundred twenty-two thousand, eight hundred seventy-seven".