16581872836 has 12 divisors (see below), whose sum is σ = 29020714128. Its totient is φ = 8290240232.

The previous prime is 16581872821. The next prime is 16581872837. The reversal of 16581872836 is 63827818561.

It is not an unprimeable number, because it can be changed into a prime (16581872837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118486 + ... + 217261.

It is an arithmetic number, because the mean of its divisors is an integer number (2418392844).

Almost surely, 2^16581872836 is an apocalyptic number.

It is an amenable number.

16581872836 is a deficient number, since it is larger than the sum of its proper divisors (12438841292).

16581872836 is a wasteful number, since it uses less digits than its factorization.

16581872836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348098 (or 348096 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 55.

The spelling of 16581872836 in words is "sixteen billion, five hundred eighty-one million, eight hundred seventy-two thousand, eight hundred thirty-six".