77018399641 has 2 divisors, whose sum is σ = 77018399642. Its totient is φ = 77018399640.

The previous prime is 77018399609. The next prime is 77018399663. The reversal of 77018399641 is 14699381077.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76893071616 + 125328025 = 277296^2 + 11195^2 .

It is a cyclic number.

It is not a de Polignac number, because 77018399641 - 2⁵ = 77018399609 is a prime.

It is not a weakly prime, because it can be changed into another prime (77018399681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38509199820 + 38509199821.

It is an arithmetic number, because the mean of its divisors is an integer number (38509199821).

Almost surely, 2^77018399641 is an apocalyptic number.

It is an amenable number.

77018399641 is a deficient number, since it is larger than the sum of its proper divisors (1).

77018399641 is an equidigital number, since it uses as much as digits as its factorization.

77018399641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 77018399641 in words is "seventy-seven billion, eighteen million, three hundred ninety-nine thousand, six hundred forty-one".