18918268315 has 16 divisors (see below), whose sum is σ = 23777064000. Its totient is φ = 14422748032.

The previous prime is 18918268297. The next prime is 18918268319. The reversal of 18918268315 is 51386281981.

It is a cyclic number.

It is not a de Polignac number, because 18918268315 - 2¹⁵ = 18918235547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18918268319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274840 + ... + 336709.

It is an arithmetic number, because the mean of its divisors is an integer number (1486066500).

Almost surely, 2^18918268315 is an apocalyptic number.

18918268315 is a deficient number, since it is larger than the sum of its proper divisors (4858795685).

18918268315 is a wasteful number, since it uses less digits than its factorization.

18918268315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611846.

The product of its digits is 829440, while the sum is 52.

The spelling of 18918268315 in words is "eighteen billion, nine hundred eighteen million, two hundred sixty-eight thousand, three hundred fifteen".