778791505197877 has 16 divisors (see below), whose sum is σ = 815381604449280. Its totient is φ = 743199540339312.

The previous prime is 778791505197787. The next prime is 778791505197913.

778791505197877 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-778791505197877 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 (778791505177877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 941222653 + ... + 942049714.

It is an arithmetic number, because the mean of its divisors is an integer number (50961350278080).

Almost surely, 2^{778791505197877} is an apocalyptic number.

It is an amenable number.

778791505197877 is a deficient number, since it is larger than the sum of its proper divisors (36590099251403).

778791505197877 is a wasteful number, since it uses less digits than its factorization.

778791505197877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883272632.

The product of its (nonzero) digits is 15247310400, while the sum is 88.

The spelling of 778791505197877 in words is "seven hundred seventy-eight trillion, seven hundred ninety-one billion, five hundred five million, one hundred ninety-seven thousand, eight hundred seventy-seven".