91777758361 has 4 divisors (see below), whose sum is σ = 93730476672. Its totient is φ = 89825040052.

The previous prime is 91777758341. The next prime is 91777758379. The reversal of 91777758361 is 16385777719.

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: 16385777719 = 647 ⋅25325777.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91777758361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91777758361.

It is not an unprimeable number, because it can be changed into a prime (91777758341) 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 in 3 ways as a sum of consecutive naturals, for example, 976359085 + ... + 976359178.

It is an arithmetic number, because the mean of its divisors is an integer number (23432619168).

Almost surely, 2^91777758361 is an apocalyptic number.

It is an amenable number.

91777758361 is a deficient number, since it is larger than the sum of its proper divisors (1952718311).

91777758361 is a wasteful number, since it uses less digits than its factorization.

91777758361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952718310.

The product of its digits is 15558480, while the sum is 61.

The spelling of 91777758361 in words is "ninety-one billion, seven hundred seventy-seven million, seven hundred fifty-eight thousand, three hundred sixty-one".