16691642866 has 16 divisors (see below), whose sum is σ = 25759270944. Its totient is φ = 8108632224.

The previous prime is 16691642843. The next prime is 16691642887. The reversal of 16691642866 is 66824619661.

It is a super-2 number, since 2×16691642866² (a number of 21 digits) contains 22 as substring.

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, 843400 + ... + 862963.

It is an arithmetic number, because the mean of its divisors is an integer number (1609954434).

Almost surely, 2^16691642866 is an apocalyptic number.

16691642866 is a deficient number, since it is larger than the sum of its proper divisors (9067628078).

16691642866 is a wasteful number, since it uses less digits than its factorization.

16691642866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706505.

The product of its digits is 4478976, while the sum is 55.

The spelling of 16691642866 in words is "sixteen billion, six hundred ninety-one million, six hundred forty-two thousand, eight hundred sixty-six".