16001666566659 has 24 divisors (see below), whose sum is σ = 24139931112960. Its totient is φ = 10194874799472.

The previous prime is 16001666566651. The next prime is 16001666566661. The reversal of 16001666566659 is 95666566610061.

16001666566659 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16001666566659 - 2³ = 16001666566651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16001666566596 and 16001666566605.

It is not an unprimeable number, because it can be changed into a prime (16001666566651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34185499 + ... + 34650420.

It is an arithmetic number, because the mean of its divisors is an integer number (1005830463040).

Almost surely, 2^{16001666566659} is an apocalyptic number.

16001666566659 is a deficient number, since it is larger than the sum of its proper divisors (8138264546301).

16001666566659 is a wasteful number, since it uses less digits than its factorization.

16001666566659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68837071 (or 68837068 counting only the distinct ones).

The product of its (nonzero) digits is 62985600, while the sum is 63.

The spelling of 16001666566659 in words is "sixteen trillion, one billion, six hundred sixty-six million, five hundred sixty-six thousand, six hundred fifty-nine".