52218111972 has 96 divisors (see below), whose sum is σ = 132422090752. Its totient is φ = 15919618176.

The previous prime is 52218111943. The next prime is 52218111997. The reversal of 52218111972 is 27911181225.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 52218111972.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22247703 + ... + 22250049.

Almost surely, 2^52218111972 is an apocalyptic number.

52218111972 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 52218111972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66211045376).

52218111972 is an abundant number, since it is smaller than the sum of its proper divisors (80203978780).

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

52218111972 is a wasteful number, since it uses less digits than its factorization.

52218111972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3617 (or 3615 counting only the distinct ones).

The product of its digits is 20160, while the sum is 39.

The spelling of 52218111972 in words is "fifty-two billion, two hundred eighteen million, one hundred eleven thousand, nine hundred seventy-two".