16681008729 has 32 divisors (see below), whose sum is σ = 27745191936. Its totient is φ = 8660545920.

The previous prime is 16681008709. The next prime is 16681008733. The reversal of 16681008729 is 92780018661.

It is not a de Polignac number, because 16681008729 - 2⁹ = 16681008217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16681008709) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 407109 + ... + 446205.

It is an arithmetic number, because the mean of its divisors is an integer number (867037248).

Almost surely, 2^16681008729 is an apocalyptic number.

It is an amenable number.

16681008729 is a deficient number, since it is larger than the sum of its proper divisors (11064183207).

16681008729 is a wasteful number, since it uses less digits than its factorization.

16681008729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40965.

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 16681008729 in words is "sixteen billion, six hundred eighty-one million, eight thousand, seven hundred twenty-nine".