77013692891 has 2 divisors, whose sum is σ = 77013692892. Its totient is φ = 77013692890.

The previous prime is 77013692887. The next prime is 77013692929. The reversal of 77013692891 is 19829631077.

It is a weak prime.

It is an emirp because it is prime and its reverse (19829631077) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77013692891 - 2² = 77013692887 is a prime.

It is a super-2 number, since 2×77013692891² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77013692851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38506846445 + 38506846446.

It is an arithmetic number, because the mean of its divisors is an integer number (38506846446).

Almost surely, 2^77013692891 is an apocalyptic number.

77013692891 is a deficient number, since it is larger than the sum of its proper divisors (1).

77013692891 is an equidigital number, since it uses as much as digits as its factorization.

77013692891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The spelling of 77013692891 in words is "seventy-seven billion, thirteen million, six hundred ninety-two thousand, eight hundred ninety-one".