18503678436 has 12 divisors (see below), whose sum is σ = 43175249712. Its totient is φ = 6167892808.

The previous prime is 18503678399. The next prime is 18503678449. The reversal of 18503678436 is 63487630581.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×18503678436² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770986590 + ... + 770986613.

It is an arithmetic number, because the mean of its divisors is an integer number (3597937476).

Almost surely, 2^18503678436 is an apocalyptic number.

It is an amenable number.

18503678436 is an abundant number, since it is smaller than the sum of its proper divisors (24671571276).

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

18503678436 is a wasteful number, since it uses less digits than its factorization.

18503678436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541973210 (or 1541973208 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 18503678436 in words is "eighteen billion, five hundred three million, six hundred seventy-eight thousand, four hundred thirty-six".