16861868388 has 48 divisors (see below), whose sum is σ = 44269344000. Its totient is φ = 5549472864.

The previous prime is 16861868371. The next prime is 16861868411. The reversal of 16861868388 is 88386816861.

16861868388 is a `hidden beast` number, since 1 + 6 + 8 + 618 + 6 + 8 + 3 + 8 + 8 = 666.

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, 979623 + ... + 996686.

It is an arithmetic number, because the mean of its divisors is an integer number (922278000).

Almost surely, 2^16861868388 is an apocalyptic number.

16861868388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

16861868388 is an abundant number, since it is smaller than the sum of its proper divisors (27407475612).

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

16861868388 is a wasteful number, since it uses less digits than its factorization.

16861868388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976401 (or 1976393 counting only the distinct ones).

The product of its digits is 21233664, while the sum is 63.

The spelling of 16861868388 in words is "sixteen billion, eight hundred sixty-one million, eight hundred sixty-eight thousand, three hundred eighty-eight".