77038961013491 has 2 divisors, whose sum is σ = 77038961013492. Its totient is φ = 77038961013490.

The previous prime is 77038961013461. The next prime is 77038961013517. The reversal of 77038961013491 is 19431016983077.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77038961013491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77038961013491.

It is not a weakly prime, because it can be changed into another prime (77038961013461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38519480506745 + 38519480506746.

It is an arithmetic number, because the mean of its divisors is an integer number (38519480506746).

Almost surely, 2^{77038961013491} is an apocalyptic number.

77038961013491 is a deficient number, since it is larger than the sum of its proper divisors (1).

77038961013491 is an equidigital number, since it uses as much as digits as its factorization.

77038961013491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6858432, while the sum is 59.

The spelling of 77038961013491 in words is "seventy-seven trillion, thirty-eight billion, nine hundred sixty-one million, thirteen thousand, four hundred ninety-one".