16006651666 has 8 divisors (see below), whose sum is σ = 24011383500. Its totient is φ = 8002857168.

The previous prime is 16006651651. The next prime is 16006651697. The reversal of 16006651666 is 66615660061.

It can be written as a sum of positive squares in 2 ways, for example, as 15894905625 + 111746041 = 126075^2 + 10571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×16006651666³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189961 + ... + 260956.

Almost surely, 2^16006651666 is an apocalyptic number.

16006651666 is a deficient number, since it is larger than the sum of its proper divisors (8004731834).

16006651666 is a wasteful number, since it uses less digits than its factorization.

16006651666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468668.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 16006651666 in words is "sixteen billion, six million, six hundred fifty-one thousand, six hundred sixty-six".