855564783979 has 4 divisors (see below), whose sum is σ = 855590626800. Its totient is φ = 855538941160.

The previous prime is 855564783971. The next prime is 855564783991. The reversal of 855564783979 is 979387465558.

855564783979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 855564783979 - 2³ = 855564783971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855564783971) 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, 12871687 + ... + 12937984.

It is an arithmetic number, because the mean of its divisors is an integer number (213897656700).

Almost surely, 2^855564783979 is an apocalyptic number.

855564783979 is a deficient number, since it is larger than the sum of its proper divisors (25842821).

855564783979 is a wasteful number, since it uses less digits than its factorization.

855564783979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25842820.

The product of its digits is 2286144000, while the sum is 76.

The spelling of 855564783979 in words is "eight hundred fifty-five billion, five hundred sixty-four million, seven hundred eighty-three thousand, nine hundred seventy-nine".