77786585128691 has 2 divisors, whose sum is σ = 77786585128692. Its totient is φ = 77786585128690.

The previous prime is 77786585128673. The next prime is 77786585128757. The reversal of 77786585128691 is 19682158568777.

It is a weak prime.

It is an emirp because it is prime and its reverse (19682158568777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77786585128691 - 2¹⁸ = 77786584866547 is a prime.

It is not a weakly prime, because it can be changed into another prime (77786585128591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38893292564345 + 38893292564346.

It is an arithmetic number, because the mean of its divisors is an integer number (38893292564346).

Almost surely, 2^{77786585128691} is an apocalyptic number.

77786585128691 is a deficient number, since it is larger than the sum of its proper divisors (1).

77786585128691 is an equidigital number, since it uses as much as digits as its factorization.

77786585128691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2844979200, while the sum is 80.

The spelling of 77786585128691 in words is "seventy-seven trillion, seven hundred eighty-six billion, five hundred eighty-five million, one hundred twenty-eight thousand, six hundred ninety-one".