18032915640 has 32 divisors (see below), whose sum is σ = 54098747280. Its totient is φ = 4808777472.

The previous prime is 18032915557. The next prime is 18032915647. The reversal of 18032915640 is 4651923081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18032915647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75137029 + ... + 75137268.

Almost surely, 2^18032915640 is an apocalyptic number.

18032915640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18032915640 is an abundant number, since it is smaller than the sum of its proper divisors (36065831640).

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

18032915640 is a wasteful number, since it uses less digits than its factorization.

18032915640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150274311 (or 150274307 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 18032915640 in words is "eighteen billion, thirty-two million, nine hundred fifteen thousand, six hundred forty".