18031351545 has 16 divisors (see below), whose sum is σ = 32055736320. Its totient is φ = 9616720752.

The previous prime is 18031351537. The next prime is 18031351567. The reversal of 18031351545 is 54515313081.

It is a happy number.

18031351545 is a `hidden beast` number, since 1 + 80 + 3 + 1 + 35 + 1 + 545 = 666.

It is not a de Polignac number, because 18031351545 - 2³ = 18031351537 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66782649 + ... + 66782918.

It is an arithmetic number, because the mean of its divisors is an integer number (2003483520).

Almost surely, 2^18031351545 is an apocalyptic number.

18031351545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18031351545 is a deficient number, since it is larger than the sum of its proper divisors (14024384775).

18031351545 is a wasteful number, since it uses less digits than its factorization.

18031351545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133565581 (or 133565575 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The spelling of 18031351545 in words is "eighteen billion, thirty-one million, three hundred fifty-one thousand, five hundred forty-five".