853661817894 has 16 divisors (see below), whose sum is σ = 1743649671168. Its totient is φ = 278499600072.

The previous prime is 853661817857. The next prime is 853661817947. The reversal of 853661817894 is 498718166358.

It is a happy number.

It is a congruent number.

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, 1513584502 + ... + 1513585065.

It is an arithmetic number, because the mean of its divisors is an integer number (108978104448).

Almost surely, 2^853661817894 is an apocalyptic number.

853661817894 is an abundant number, since it is smaller than the sum of its proper divisors (889987853274).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

853661817894 is a wasteful number, since it uses less digits than its factorization.

853661817894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3027169619.

The product of its digits is 69672960, while the sum is 66.

The spelling of 853661817894 in words is "eight hundred fifty-three billion, six hundred sixty-one million, eight hundred seventeen thousand, eight hundred ninety-four".