77964236791 has 16 divisors (see below), whose sum is σ = 91297926720. Its totient is φ = 65180344320.

The previous prime is 77964236747. The next prime is 77964236797. The reversal of 77964236791 is 19763246977.

It is not a de Polignac number, because 77964236791 - 2¹⁷ = 77964105719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77964236797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1199275 + ... + 1262611.

It is an arithmetic number, because the mean of its divisors is an integer number (5706120420).

Almost surely, 2^77964236791 is an apocalyptic number.

77964236791 is a deficient number, since it is larger than the sum of its proper divisors (13333689929).

77964236791 is a wasteful number, since it uses less digits than its factorization.

77964236791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67674.

The product of its digits is 24004512, while the sum is 61.

The spelling of 77964236791 in words is "seventy-seven billion, nine hundred sixty-four million, two hundred thirty-six thousand, seven hundred ninety-one".