18515012136 has 32 divisors (see below), whose sum is σ = 47780678400. Its totient is φ = 5972584320.

The previous prime is 18515012107. The next prime is 18515012147. The reversal of 18515012136 is 63121051581.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18515012097 and 18515012106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12442141 + ... + 12443628.

It is an arithmetic number, because the mean of its divisors is an integer number (1493146200).

Almost surely, 2^18515012136 is an apocalyptic number.

It is an amenable number.

18515012136 is an abundant number, since it is smaller than the sum of its proper divisors (29265666264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18515012136 is a wasteful number, since it uses less digits than its factorization.

18515012136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24885809 (or 24885805 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The spelling of 18515012136 in words is "eighteen billion, five hundred fifteen million, twelve thousand, one hundred thirty-six".