18718635145 has 16 divisors (see below), whose sum is σ = 27181346688. Its totient is φ = 12080597760.

The previous prime is 18718635139. The next prime is 18718635161. The reversal of 18718635145 is 54153681781.

It is a happy number.

It is not a de Polignac number, because 18718635145 - 2²⁷ = 18584417417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15729351 + ... + 15730540.

It is an arithmetic number, because the mean of its divisors is an integer number (1698834168).

Almost surely, 2^18718635145 is an apocalyptic number.

It is an amenable number.

18718635145 is a deficient number, since it is larger than the sum of its proper divisors (8462711543).

18718635145 is a wasteful number, since it uses less digits than its factorization.

18718635145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31459920.

The product of its digits is 806400, while the sum is 49.

The spelling of 18718635145 in words is "eighteen billion, seven hundred eighteen million, six hundred thirty-five thousand, one hundred forty-five".