18245909108981 has 8 divisors (see below), whose sum is σ = 18500181926040. Its totient is φ = 17991753288192.

The previous prime is 18245909108953. The next prime is 18245909109019. The reversal of 18245909108981 is 18980190954281.

It can be written as a sum of positive squares in 4 ways, for example, as 1689066728881 + 16556842380100 = 1299641^2 + 4069010^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18245909108981 - 2¹⁰ = 18245909107957 is a prime.

It is a super-2 number, since 2×18245909108981² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18245909008981) 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, 28934966 + ... + 29558823.

It is an arithmetic number, because the mean of its divisors is an integer number (2312522740755).

Almost surely, 2^{18245909108981} is an apocalyptic number.

It is an amenable number.

18245909108981 is a deficient number, since it is larger than the sum of its proper divisors (254272817059).

18245909108981 is an equidigital number, since it uses as much as digits as its factorization.

18245909108981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58498135.

The product of its (nonzero) digits is 14929920, while the sum is 65.

The spelling of 18245909108981 in words is "eighteen trillion, two hundred forty-five billion, nine hundred nine million, one hundred eight thousand, nine hundred eighty-one".