17986655738856 has 64 divisors (see below), whose sum is σ = 51412975850880. Its totient is φ = 5136791408640.

The previous prime is 17986655738833. The next prime is 17986655738893. The reversal of 17986655738856 is 65883755668971.

It is a Harshad number since it is a multiple of its sum of digits (84).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23085321 + ... + 23851736.

It is an arithmetic number, because the mean of its divisors is an integer number (803327747670).

Almost surely, 2^{17986655738856} is an apocalyptic number.

It is an amenable number.

17986655738856 is an abundant number, since it is smaller than the sum of its proper divisors (33426320112024).

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

17986655738856 is a wasteful number, since it uses less digits than its factorization.

17986655738856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46939354 (or 46939350 counting only the distinct ones).

The product of its digits is 18289152000, while the sum is 84.

The spelling of 17986655738856 in words is "seventeen trillion, nine hundred eighty-six billion, six hundred fifty-five million, seven hundred thirty-eight thousand, eight hundred fifty-six".