16691405686 has 16 divisors (see below), whose sum is σ = 25596305136. Its totient is φ = 8161122816.

The previous prime is 16691405663. The next prime is 16691405711. The reversal of 16691405686 is 68650419661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436251 + ... + 472966.

It is an arithmetic number, because the mean of its divisors is an integer number (1599769071).

Almost surely, 2^16691405686 is an apocalyptic number.

16691405686 is a deficient number, since it is larger than the sum of its proper divisors (8904899450).

16691405686 is a wasteful number, since it uses less digits than its factorization.

16691405686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909423.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 16691405686 in words is "sixteen billion, six hundred ninety-one million, four hundred five thousand, six hundred eighty-six".