18518683522 has 8 divisors (see below), whose sum is σ = 27815923836. Its totient is φ = 9246708912.

The previous prime is 18518683517. The next prime is 18518683523. The reversal of 18518683522 is 22538681581.

It can be written as a sum of positive squares in 2 ways, for example, as 17318823201 + 1199860321 = 131601^2 + 34639^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18518683523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6314593 + ... + 6317524.

Almost surely, 2^18518683522 is an apocalyptic number.

18518683522 is a deficient number, since it is larger than the sum of its proper divisors (9297240314).

18518683522 is a wasteful number, since it uses less digits than its factorization.

18518683522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12632852.

The product of its digits is 921600, while the sum is 49.

The spelling of 18518683522 in words is "eighteen billion, five hundred eighteen million, six hundred eighty-three thousand, five hundred twenty-two".