91777426393 has 4 divisors (see below), whose sum is σ = 91781412480. Its totient is φ = 91773440308.

The previous prime is 91777426357. The next prime is 91777426463. The reversal of 91777426393 is 39362477719.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39362477719 = 223 ⋅176513353.

It is a cyclic number.

It is not a de Polignac number, because 91777426393 - 2⁹ = 91777425881 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91777426313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1958305 + ... + 2004622.

It is an arithmetic number, because the mean of its divisors is an integer number (22945353120).

Almost surely, 2^91777426393 is an apocalyptic number.

It is an amenable number.

91777426393 is a deficient number, since it is larger than the sum of its proper divisors (3986087).

91777426393 is a wasteful number, since it uses less digits than its factorization.

91777426393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986086.

The product of its digits is 12002256, while the sum is 58.

The spelling of 91777426393 in words is "ninety-one billion, seven hundred seventy-seven million, four hundred twenty-six thousand, three hundred ninety-three".