91676777687 has 4 divisors (see below), whose sum is σ = 100011030216. Its totient is φ = 83342525160.

The previous prime is 91676777641. The next prime is 91676777701. The reversal of 91676777687 is 78677767619.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91676777687 - 2⁶ = 91676777623 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 91676777687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91676777627) 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, 4167126248 + ... + 4167126269.

It is an arithmetic number, because the mean of its divisors is an integer number (25002757554).

Almost surely, 2^91676777687 is an apocalyptic number.

91676777687 is a deficient number, since it is larger than the sum of its proper divisors (8334252529).

91676777687 is a wasteful number, since it uses less digits than its factorization.

91676777687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8334252528.

The product of its digits is 261382464, while the sum is 71.

The spelling of 91676777687 in words is "ninety-one billion, six hundred seventy-six million, seven hundred seventy-seven thousand, six hundred eighty-seven".