818277772818 has 16 divisors (see below), whose sum is σ = 1785333322656. Its totient is φ = 247962961440.

The previous prime is 818277772799. The next prime is 818277772853.

818277772818 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×818277772818² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66), and also a Moran number because the ratio is a prime number: 12398148073 = 818277772818 / (8 + 1 + 8 + 2 + 7 + 7 + 7 + 7 + 2 + 8 + 1 + 8).

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, 6199073971 + ... + 6199074102.

It is an arithmetic number, because the mean of its divisors is an integer number (111583332666).

Almost surely, 2^818277772818 is an apocalyptic number.

818277772818 is an abundant number, since it is smaller than the sum of its proper divisors (967055549838).

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

818277772818 is a wasteful number, since it uses less digits than its factorization.

818277772818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12398148089.

The product of its digits is 39337984, while the sum is 66.

The spelling of 818277772818 in words is "eight hundred eighteen billion, two hundred seventy-seven million, seven hundred seventy-two thousand, eight hundred eighteen".