18711226436 has 36 divisors (see below), whose sum is σ = 38231375616. Its totient is φ = 7989483600.

The previous prime is 18711226381. The next prime is 18711226463. The reversal of 18711226436 is 63462211781.

It is a junction number, because it is equal to n+sod(n) for n = 18711226393 and 18711226402.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123020 + ... + 229251.

It is an arithmetic number, because the mean of its divisors is an integer number (1061982656).

Almost surely, 2^18711226436 is an apocalyptic number.

It is an amenable number.

18711226436 is an abundant number, since it is smaller than the sum of its proper divisors (19520149180).

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

18711226436 is a wasteful number, since it uses less digits than its factorization.

18711226436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352560 (or 352551 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The spelling of 18711226436 in words is "eighteen billion, seven hundred eleven million, two hundred twenty-six thousand, four hundred thirty-six".