18340687915 has 32 divisors (see below), whose sum is σ = 25838792640. Its totient is φ = 12348211200.

The previous prime is 18340687913. The next prime is 18340687943. The reversal of 18340687915 is 51978604381.

It is not a de Polignac number, because 18340687915 - 2¹ = 18340687913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18340687913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103750 + ... + 217819.

It is an arithmetic number, because the mean of its divisors is an integer number (807462270).

Almost surely, 2^18340687915 is an apocalyptic number.

18340687915 is a deficient number, since it is larger than the sum of its proper divisors (7498104725).

18340687915 is a wasteful number, since it uses less digits than its factorization.

18340687915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321663.

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 18340687915 in words is "eighteen billion, three hundred forty million, six hundred eighty-seven thousand, nine hundred fifteen".