77964236731 has 2 divisors, whose sum is σ = 77964236732. Its totient is φ = 77964236730.

The previous prime is 77964236723. The next prime is 77964236747. The reversal of 77964236731 is 13763246977.

It is a weak prime.

It is an emirp because it is prime and its reverse (13763246977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77964236731 - 2³ = 77964236723 is a prime.

It is a super-2 number, since 2×77964236731² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77964236431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38982118365 + 38982118366.

It is an arithmetic number, because the mean of its divisors is an integer number (38982118366).

Almost surely, 2^77964236731 is an apocalyptic number.

77964236731 is a deficient number, since it is larger than the sum of its proper divisors (1).

77964236731 is an equidigital number, since it uses as much as digits as its factorization.

77964236731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8001504, while the sum is 55.

The spelling of 77964236731 in words is "seventy-seven billion, nine hundred sixty-four million, two hundred thirty-six thousand, seven hundred thirty-one".