91779058793 has 2 divisors, whose sum is σ = 91779058794. Its totient is φ = 91779058792.

The previous prime is 91779058747. The next prime is 91779058837. The reversal of 91779058793 is 39785097719.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66578448784 + 25200610009 = 258028^2 + 158747^2 .

It is a cyclic number.

It is not a de Polignac number, because 91779058793 - 2⁸ = 91779058537 is a prime.

It is not a weakly prime, because it can be changed into another prime (91779058733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45889529396 + 45889529397.

It is an arithmetic number, because the mean of its divisors is an integer number (45889529397).

Almost surely, 2^91779058793 is an apocalyptic number.

It is an amenable number.

91779058793 is a deficient number, since it is larger than the sum of its proper divisors (1).

91779058793 is an equidigital number, since it uses as much as digits as its factorization.

91779058793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30005640, while the sum is 65.

The spelling of 91779058793 in words is "ninety-one billion, seven hundred seventy-nine million, fifty-eight thousand, seven hundred ninety-three".