818874776889 has 27 divisors (see below), whose sum is σ = 1280859340527. Its totient is φ = 503901221616.

The previous prime is 818874776879. The next prime is 818874776897. The reversal of 818874776889 is 988677478818.

The square root of 818874776889 is 904917.

It is a perfect power (a square), and thus also a powerful number.

818874776889 is a `hidden beast` number, since 8 + 1 + 8 + 8 + 7 + 477 + 68 + 89 = 666.

It can be written as a sum of positive squares in only one way, i.e., 121135322025 + 697739454864 = 348045^2 + 835308^2 .

It is a de Polignac number, because none of the positive numbers 2^k-818874776889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (818874776879) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 35280162 + ... + 35303364.

Almost surely, 2^818874776889 is an apocalyptic number.

818874776889 is the 904917-th square number.

818874776889 is the 452459-th centered octagonal number.

It is an amenable number.

818874776889 is a deficient number, since it is larger than the sum of its proper divisors (461984563638).

818874776889 is an frugal number, since it uses more digits than its factorization.

818874776889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46438 (or 23219 counting only the distinct ones).

The product of its digits is 2427715584, while the sum is 81.

Multiplying 818874776889 by its sum of digits (81), we get a square (66328856928009 = 8144253²).

The spelling of 818874776889 in words is "eight hundred eighteen billion, eight hundred seventy-four million, seven hundred seventy-six thousand, eight hundred eighty-nine".