16667121667 has 4 divisors (see below), whose sum is σ = 19048139056. Its totient is φ = 14286104280.

The previous prime is 16667121659. The next prime is 16667121721. The reversal of 16667121667 is 76612176661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76612176661 = 43 ⋅1781678527.

It is not a de Polignac number, because 16667121667 - 2³ = 16667121659 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 16667121667.

It is not an unprimeable number, because it can be changed into a prime (16667121637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1190508684 + ... + 1190508697.

It is an arithmetic number, because the mean of its divisors is an integer number (4762034764).

Almost surely, 2^16667121667 is an apocalyptic number.

16667121667 is a deficient number, since it is larger than the sum of its proper divisors (2381017389).

16667121667 is an equidigital number, since it uses as much as digits as its factorization.

16667121667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381017388.

The product of its digits is 762048, while the sum is 49.

The spelling of 16667121667 in words is "sixteen billion, six hundred sixty-seven million, one hundred twenty-one thousand, six hundred sixty-seven".