18515688468 has 24 divisors (see below), whose sum is σ = 43350732768. Its totient is φ = 6150830496.

The previous prime is 18515688467. The next prime is 18515688487. The reversal of 18515688468 is 86488651581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18515688467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2629546 + ... + 2636577.

It is an arithmetic number, because the mean of its divisors is an integer number (1806280532).

Almost surely, 2^18515688468 is an apocalyptic number.

It is an amenable number.

18515688468 is an abundant number, since it is smaller than the sum of its proper divisors (24835044300).

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

18515688468 is a wasteful number, since it uses less digits than its factorization.

18515688468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5266423 (or 5266421 counting only the distinct ones).

The product of its digits is 14745600, while the sum is 60.

The spelling of 18515688468 in words is "eighteen billion, five hundred fifteen million, six hundred eighty-eight thousand, four hundred sixty-eight".