18243980331 has 8 divisors (see below), whose sum is σ = 24339432000. Its totient is φ = 12155591112.

The previous prime is 18243980303. The next prime is 18243980353. The reversal of 18243980331 is 13308934281.

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

It is not a de Polignac number, because 18243980331 - 2⁶ = 18243980267 is a prime.

It is a super-2 number, since 2×18243980331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18243980231) 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, 1759581 + ... + 1769918.

It is an arithmetic number, because the mean of its divisors is an integer number (3042429000).

Almost surely, 2^18243980331 is an apocalyptic number.

18243980331 is a deficient number, since it is larger than the sum of its proper divisors (6095451669).

18243980331 is a wasteful number, since it uses less digits than its factorization.

18243980331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3531225.

The product of its (nonzero) digits is 124416, while the sum is 42.

The spelling of 18243980331 in words is "eighteen billion, two hundred forty-three million, nine hundred eighty thousand, three hundred thirty-one".