18914193515 has 16 divisors (see below), whose sum is σ = 26048010240. Its totient is φ = 12915460320.

The previous prime is 18914193491. The next prime is 18914193521. The reversal of 18914193515 is 51539141981.

It is not a de Polignac number, because 18914193515 - 2¹⁶ = 18914127979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18914193515.

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, 1122191 + ... + 1138920.

It is an arithmetic number, because the mean of its divisors is an integer number (1628000640).

Almost surely, 2^18914193515 is an apocalyptic number.

18914193515 is a deficient number, since it is larger than the sum of its proper divisors (7133816725).

18914193515 is a wasteful number, since it uses less digits than its factorization.

18914193515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261362.

The product of its digits is 194400, while the sum is 47.

The spelling of 18914193515 in words is "eighteen billion, nine hundred fourteen million, one hundred ninety-three thousand, five hundred fifteen".