779116345421 has 4 divisors (see below), whose sum is σ = 780063024672. Its totient is φ = 778169666172.

The previous prime is 779116345409. The next prime is 779116345451. The reversal of 779116345421 is 124543611977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 779116345421 - 2²² = 779112151117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 779116345421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (779116345451) 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, 473338391 + ... + 473340036.

It is an arithmetic number, because the mean of its divisors is an integer number (195015756168).

Almost surely, 2^779116345421 is an apocalyptic number.

It is an amenable number.

779116345421 is a deficient number, since it is larger than the sum of its proper divisors (946679251).

779116345421 is an equidigital number, since it uses as much as digits as its factorization.

779116345421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946679250.

The product of its digits is 1270080, while the sum is 50.

The spelling of 779116345421 in words is "seven hundred seventy-nine billion, one hundred sixteen million, three hundred forty-five thousand, four hundred twenty-one".