77701890779 has 2 divisors, whose sum is σ = 77701890780. Its totient is φ = 77701890778.

The previous prime is 77701890733. The next prime is 77701890809. The reversal of 77701890779 is 97709810777.

It is a strong prime.

It is an emirp because it is prime and its reverse (97709810777) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77701890779 is a prime.

It is not a weakly prime, because it can be changed into another prime (77701890709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38850945389 + 38850945390.

It is an arithmetic number, because the mean of its divisors is an integer number (38850945390).

Almost surely, 2^77701890779 is an apocalyptic number.

77701890779 is a deficient number, since it is larger than the sum of its proper divisors (1).

77701890779 is an equidigital number, since it uses as much as digits as its factorization.

77701890779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10890936, while the sum is 62.

The spelling of 77701890779 in words is "seventy-seven billion, seven hundred one million, eight hundred ninety thousand, seven hundred seventy-nine".