16666999999907 has 4 divisors (see below), whose sum is σ = 17391652173840. Its totient is φ = 15942347825976.

The previous prime is 16666999999889. The next prime is 16666999999927. The reversal of 16666999999907 is 70999999966661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16666999999907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16666999999907.

It is not an unprimeable number, because it can be changed into a prime (16666999999927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362326086932 + ... + 362326086977.

It is an arithmetic number, because the mean of its divisors is an integer number (4347913043460).

Almost surely, 2^{16666999999907} is an apocalyptic number.

16666999999907 is a deficient number, since it is larger than the sum of its proper divisors (724652173933).

16666999999907 is an equidigital number, since it uses as much as digits as its factorization.

16666999999907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724652173932.

The product of its (nonzero) digits is 43391094768, while the sum is 95.

The spelling of 16666999999907 in words is "sixteen trillion, six hundred sixty-six billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seven".