18418309056 has 84 divisors (see below), whose sum is σ = 60334593072. Its totient is φ = 5262372864.

The previous prime is 18418309027. The next prime is 18418309057. The reversal of 18418309056 is 65090381481.

It is a tau number, because it is divible by the number of its divisors (84).

It is a super-2 number, since 2×18418309056² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18418309057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2279985 + ... + 2288048.

Almost surely, 2^18418309056 is an apocalyptic number.

18418309056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18418309056 is an abundant number, since it is smaller than the sum of its proper divisors (41916284016).

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

18418309056 is a wasteful number, since it uses less digits than its factorization.

18418309056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4568058 (or 4568045 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 18418309056 in words is "eighteen billion, four hundred eighteen million, three hundred nine thousand, fifty-six".