18226332772 has 24 divisors (see below), whose sum is σ = 32665713696. Its totient is φ = 8893633728.

The previous prime is 18226332703. The next prime is 18226332779. The reversal of 18226332772 is 27723362281.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (18226332779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159528 + ... + 248800.

It is an arithmetic number, because the mean of its divisors is an integer number (1361071404).

Almost surely, 2^18226332772 is an apocalyptic number.

It is an amenable number.

18226332772 is a deficient number, since it is larger than the sum of its proper divisors (14439380924).

18226332772 is a wasteful number, since it uses less digits than its factorization.

18226332772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90507 (or 90505 counting only the distinct ones).

The product of its digits is 338688, while the sum is 43.

The spelling of 18226332772 in words is "eighteen billion, two hundred twenty-six million, three hundred thirty-two thousand, seven hundred seventy-two".