18532181508 has 48 divisors (see below), whose sum is σ = 46468787904. Its totient is φ = 5727237120.

The previous prime is 18532181501. The next prime is 18532181537. The reversal of 18532181508 is 80518123581.

It is a self number, because there is not a number n which added to its sum of digits gives 18532181508.

It is not an unprimeable number, because it can be changed into a prime (18532181501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 664273 + ... + 691608.

It is an arithmetic number, because the mean of its divisors is an integer number (968099748).

Almost surely, 2^18532181508 is an apocalyptic number.

It is an amenable number.

18532181508 is an abundant number, since it is smaller than the sum of its proper divisors (27936606396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18532181508 is a wasteful number, since it uses less digits than its factorization.

18532181508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355972 (or 1355970 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 42.

The spelling of 18532181508 in words is "eighteen billion, five hundred thirty-two million, one hundred eighty-one thousand, five hundred eight".