18156484515 has 64 divisors (see below), whose sum is σ = 31606751232. Its totient is φ = 8847014400.

The previous prime is 18156484513. The next prime is 18156484529. The reversal of 18156484515 is 51548465181.

It is a Cunningham number, because it is equal to 134746²-1.

It is not a de Polignac number, because 18156484515 - 2¹ = 18156484513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18156484513) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17112085 + ... + 17113145.

It is an arithmetic number, because the mean of its divisors is an integer number (493855488).

Almost surely, 2^18156484515 is an apocalyptic number.

18156484515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18156484515 is a deficient number, since it is larger than the sum of its proper divisors (13450266717).

18156484515 is a wasteful number, since it uses less digits than its factorization.

18156484515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900.

The product of its digits is 768000, while the sum is 48.

The spelling of 18156484515 in words is "eighteen billion, one hundred fifty-six million, four hundred eighty-four thousand, five hundred fifteen".