16538181872 has 20 divisors (see below), whose sum is σ = 32276620176. Its totient is φ = 8208731520.

The previous prime is 16538181827. The next prime is 16538181977. The reversal of 16538181872 is 27818183561.

It is a super-2 number, since 2×16538181872² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 16538181872.

It is a congruent number.

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, 3770204 + ... + 3774587.

Almost surely, 2^16538181872 is an apocalyptic number.

It is an amenable number.

16538181872 is a deficient number, since it is larger than the sum of its proper divisors (15738438304).

16538181872 is a wasteful number, since it uses less digits than its factorization.

16538181872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7544936 (or 7544930 counting only the distinct ones).

The product of its digits is 645120, while the sum is 50.

The spelling of 16538181872 in words is "sixteen billion, five hundred thirty-eight million, one hundred eighty-one thousand, eight hundred seventy-two".