77646044731 has 2 divisors, whose sum is σ = 77646044732. Its totient is φ = 77646044730.

The previous prime is 77646044699. The next prime is 77646044761. The reversal of 77646044731 is 13744064677.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77646044731 - 2⁵ = 77646044699 is a prime.

It is a super-2 number, since 2×77646044731² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77646044761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38823022365 + 38823022366.

It is an arithmetic number, because the mean of its divisors is an integer number (38823022366).

Almost surely, 2^77646044731 is an apocalyptic number.

77646044731 is a deficient number, since it is larger than the sum of its proper divisors (1).

77646044731 is an equidigital number, since it uses as much as digits as its factorization.

77646044731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2370816, while the sum is 49.

The spelling of 77646044731 in words is "seventy-seven billion, six hundred forty-six million, forty-four thousand, seven hundred thirty-one".