18145031984 has 40 divisors (see below), whose sum is σ = 35995916352. Its totient is φ = 8856025920.

The previous prime is 18145031951. The next prime is 18145031987. The reversal of 18145031984 is 48913054181.

It is not an unprimeable number, because it can be changed into a prime (18145031987) 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, 1238687 + ... + 1253249.

Almost surely, 2^18145031984 is an apocalyptic number.

It is an amenable number.

18145031984 is a deficient number, since it is larger than the sum of its proper divisors (17850884368).

18145031984 is a wasteful number, since it uses less digits than its factorization.

18145031984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16425 (or 16419 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 18145031984 in words is "eighteen billion, one hundred forty-five million, thirty-one thousand, nine hundred eighty-four".