16721042766 has 16 divisors (see below), whose sum is σ = 33588123600. Its totient is φ = 5549341248.

The previous prime is 16721042753. The next prime is 16721042771. The reversal of 16721042766 is 66724012761.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6083431 + ... + 6086178.

It is an arithmetic number, because the mean of its divisors is an integer number (2099257725).

Almost surely, 2^16721042766 is an apocalyptic number.

16721042766 is an abundant number, since it is smaller than the sum of its proper divisors (16867080834).

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

16721042766 is a wasteful number, since it uses less digits than its factorization.

16721042766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12169843.

The product of its (nonzero) digits is 169344, while the sum is 42.

The spelling of 16721042766 in words is "sixteen billion, seven hundred twenty-one million, forty-two thousand, seven hundred sixty-six".