16681666111652 has 18 divisors (see below), whose sum is σ = 31011159581682. Its totient is φ = 7850195816704.

The previous prime is 16681666111639. The next prime is 16681666111679. The reversal of 16681666111652 is 25611166618661.

It can be written as a sum of positive squares in 3 ways, for example, as 6968881938496 + 9712784173156 = 2639864^2 + 3116534^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7215252353 + ... + 7215254664.

Almost surely, 2^{16681666111652} is an apocalyptic number.

It is an amenable number.

16681666111652 is a deficient number, since it is larger than the sum of its proper divisors (14329493470030).

16681666111652 is a wasteful number, since it uses less digits than its factorization.

16681666111652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14430507055 (or 14430507036 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 56.

The spelling of 16681666111652 in words is "sixteen trillion, six hundred eighty-one billion, six hundred sixty-six million, one hundred eleven thousand, six hundred fifty-two".