77904853255679 has 4 divisors (see below), whose sum is σ = 77904935145576. Its totient is φ = 77904771365784.

The previous prime is 77904853255661. The next prime is 77904853255703. The reversal of 77904853255679 is 97655235840977.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77904853255679 - 2²⁰ = 77904852207103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77904853255979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39500969 + ... + 41426274.

It is an arithmetic number, because the mean of its divisors is an integer number (19476233786394).

Almost surely, 2^{77904853255679} is an apocalyptic number.

77904853255679 is a deficient number, since it is larger than the sum of its proper divisors (81889897).

77904853255679 is an equidigital number, since it uses as much as digits as its factorization.

77904853255679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81889896.

The product of its (nonzero) digits is 4000752000, while the sum is 77.

The spelling of 77904853255679 in words is "seventy-seven trillion, nine hundred four billion, eight hundred fifty-three million, two hundred fifty-five thousand, six hundred seventy-nine".