18225715213 has 8 divisors (see below), whose sum is σ = 18474523200. Its totient is φ = 17977885728.

The previous prime is 18225715171. The next prime is 18225715229. The reversal of 18225715213 is 31251752281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18225715213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18225715813) 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, 207081 + ... + 281662.

It is an arithmetic number, because the mean of its divisors is an integer number (2309315400).

Almost surely, 2^18225715213 is an apocalyptic number.

It is an amenable number.

18225715213 is a deficient number, since it is larger than the sum of its proper divisors (248807987).

18225715213 is an equidigital number, since it uses as much as digits as its factorization.

18225715213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489251.

The product of its digits is 33600, while the sum is 37.

The spelling of 18225715213 in words is "eighteen billion, two hundred twenty-five million, seven hundred fifteen thousand, two hundred thirteen".