16591997806 has 16 divisors (see below), whose sum is σ = 25140139920. Its totient is φ = 8211988800.

The previous prime is 16591997797. The next prime is 16591997813. The reversal of 16591997806 is 60879919561.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1413610 + ... + 1425298.

It is an arithmetic number, because the mean of its divisors is an integer number (1571258745).

Almost surely, 2^16591997806 is an apocalyptic number.

16591997806 is a deficient number, since it is larger than the sum of its proper divisors (8548142114).

16591997806 is a wasteful number, since it uses less digits than its factorization.

16591997806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18819.

The product of its (nonzero) digits is 7348320, while the sum is 61.

The spelling of 16591997806 in words is "sixteen billion, five hundred ninety-one million, nine hundred ninety-seven thousand, eight hundred six".