856122565221658 has 16 divisors (see below), whose sum is σ = 1503434748682944. Its totient is φ = 357960654447840.

The previous prime is 856122565221607. The next prime is 856122565221661.

856122565221658 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 856122565221658.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745751362860 + ... + 745751364007.

It is an arithmetic number, because the mean of its divisors is an integer number (93964671792684).

Almost surely, 2^{856122565221658} is an apocalyptic number.

856122565221658 is a deficient number, since it is larger than the sum of its proper divisors (647312183461286).

856122565221658 is a wasteful number, since it uses less digits than its factorization.

856122565221658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491502726917.

The product of its digits is 138240000, while the sum is 64.

The spelling of 856122565221658 in words is "eight hundred fifty-six trillion, one hundred twenty-two billion, five hundred sixty-five million, two hundred twenty-one thousand, six hundred fifty-eight".