18214981524 has 18 divisors (see below), whose sum is σ = 46043425610. Its totient is φ = 6071660496.

The previous prime is 18214981513. The next prime is 18214981529. The reversal of 18214981524 is 42518941281.

18214981524 is a `hidden beast` number, since 1 + 8 + 2 + 1 + 49 + 81 + 524 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17694320400 + 520661124 = 133020^2 + 22818^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×18214981524² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18214981524.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18214981529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 252985819 + ... + 252985890.

Almost surely, 2^18214981524 is an apocalyptic number.

It is an amenable number.

18214981524 is an abundant number, since it is smaller than the sum of its proper divisors (27828444086).

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

18214981524 is a wasteful number, since it uses less digits than its factorization.

18214981524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505971719 (or 505971714 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The spelling of 18214981524 in words is "eighteen billion, two hundred fourteen million, nine hundred eighty-one thousand, five hundred twenty-four".