18616916844 has 18 divisors (see below), whose sum is σ = 47059428780. Its totient is φ = 6205638936.

The previous prime is 18616916831. The next prime is 18616916867. The reversal of 18616916844 is 44861961681.

18616916844 is a `hidden beast` number, since 1 + 8 + 616 + 9 + 16 + 8 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 258568254 + ... + 258568325.

It is an arithmetic number, because the mean of its divisors is an integer number (2614412710).

Almost surely, 2^18616916844 is an apocalyptic number.

It is an amenable number.

18616916844 is an abundant number, since it is smaller than the sum of its proper divisors (28442511936).

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

18616916844 is a wasteful number, since it uses less digits than its factorization.

18616916844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517136589 (or 517136584 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The spelling of 18616916844 in words is "eighteen billion, six hundred sixteen million, nine hundred sixteen thousand, eight hundred forty-four".