18315066544 has 20 divisors (see below), whose sum is σ = 35570145240. Its totient is φ = 9135674240.

The previous prime is 18315066509. The next prime is 18315066559. The reversal of 18315066544 is 44566051381.

It is a super-2 number, since 2×18315066544² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18315066544.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1359277 + ... + 1372684.

It is an arithmetic number, because the mean of its divisors is an integer number (1778507262).

Almost surely, 2^18315066544 is an apocalyptic number.

It is an amenable number.

18315066544 is a deficient number, since it is larger than the sum of its proper divisors (17255078696).

18315066544 is a wasteful number, since it uses less digits than its factorization.

18315066544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732388 (or 2732382 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 18315066544 in words is "eighteen billion, three hundred fifteen million, sixty-six thousand, five hundred forty-four".