779405552857 has 4 divisors (see below), whose sum is σ = 779535308416. Its totient is φ = 779275797300.

The previous prime is 779405552839. The next prime is 779405552881. The reversal of 779405552857 is 758255504977.

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 a de Polignac number, because none of the positive numbers 2^k-779405552857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (779405552257) 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, 64868769 + ... + 64880782.

It is an arithmetic number, because the mean of its divisors is an integer number (194883827104).

Almost surely, 2^779405552857 is an apocalyptic number.

It is an amenable number.

779405552857 is a deficient number, since it is larger than the sum of its proper divisors (129755559).

779405552857 is a wasteful number, since it uses less digits than its factorization.

779405552857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129755558.

The product of its (nonzero) digits is 123480000, while the sum is 64.

The spelling of 779405552857 in words is "seven hundred seventy-nine billion, four hundred five million, five hundred fifty-two thousand, eight hundred fifty-seven".