16591997784 has 64 divisors (see below), whose sum is σ = 43299936000. Its totient is φ = 5288190336.

The previous prime is 16591997713. The next prime is 16591997791. The reversal of 16591997784 is 48779919561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2258982 + ... + 2266314.

It is an arithmetic number, because the mean of its divisors is an integer number (676561500).

Almost surely, 2^16591997784 is an apocalyptic number.

It is an amenable number.

16591997784 is an abundant number, since it is smaller than the sum of its proper divisors (26707938216).

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

16591997784 is a wasteful number, since it uses less digits than its factorization.

16591997784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11464 (or 11460 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 66.

The spelling of 16591997784 in words is "sixteen billion, five hundred ninety-one million, nine hundred ninety-seven thousand, seven hundred eighty-four".