16664261666 has 16 divisors (see below), whose sum is σ = 27080391744. Its totient is φ = 7645140624.

The previous prime is 16664261651. The next prime is 16664261707. The reversal of 16664261666 is 66616246661.

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, 1914620 + ... + 1923303.

It is an arithmetic number, because the mean of its divisors is an integer number (1692524484).

Almost surely, 2^16664261666 is an apocalyptic number.

16664261666 is a deficient number, since it is larger than the sum of its proper divisors (10416130078).

16664261666 is a wasteful number, since it uses less digits than its factorization.

16664261666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3838105.

The product of its digits is 2239488, while the sum is 50.

The spelling of 16664261666 in words is "sixteen billion, six hundred sixty-four million, two hundred sixty-one thousand, six hundred sixty-six".