18051449864 has 48 divisors (see below), whose sum is σ = 41688462780. Its totient is φ = 7281254400.

The previous prime is 18051449861. The next prime is 18051449957. The reversal of 18051449864 is 46894415081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17969402500 + 82047364 = 134050^2 + 9058^2 .

It is not an unprimeable number, because it can be changed into a prime (18051449861) 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, 1347737 + ... + 1361064.

Almost surely, 2^18051449864 is an apocalyptic number.

18051449864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18051449864 is an abundant number, since it is smaller than the sum of its proper divisors (23637012916).

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

18051449864 is a wasteful number, since it uses less digits than its factorization.

18051449864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2708838 (or 2708827 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 50.

The spelling of 18051449864 in words is "eighteen billion, fifty-one million, four hundred forty-nine thousand, eight hundred sixty-four".