863818896779 has 4 divisors (see below), whose sum is σ = 883907708376. Its totient is φ = 843730085184.

The previous prime is 863818896769. The next prime is 863818896817. The reversal of 863818896779 is 977698818368.

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

It is not a de Polignac number, because 863818896779 - 2²⁰ = 863817848203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (863818896769) 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, 10044405734 + ... + 10044405819.

It is an arithmetic number, because the mean of its divisors is an integer number (220976927094).

Almost surely, 2^863818896779 is an apocalyptic number.

863818896779 is a deficient number, since it is larger than the sum of its proper divisors (20088811597).

863818896779 is a wasteful number, since it uses less digits than its factorization.

863818896779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20088811596.

The product of its digits is 1755758592, while the sum is 80.

The spelling of 863818896779 in words is "eight hundred sixty-three billion, eight hundred eighteen million, eight hundred ninety-six thousand, seven hundred seventy-nine".