16667661685 has 16 divisors (see below), whose sum is σ = 20061840960. Its totient is φ = 13293745920.

The previous prime is 16667661599. The next prime is 16667661697. The reversal of 16667661685 is 58616676661.

It is a happy number.

It is not a de Polignac number, because 16667661685 - 2¹¹ = 16667659637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5911206 + ... + 5914024.

It is an arithmetic number, because the mean of its divisors is an integer number (1253865060).

Almost surely, 2^16667661685 is an apocalyptic number.

It is an amenable number.

16667661685 is a deficient number, since it is larger than the sum of its proper divisors (3394179275).

16667661685 is a wasteful number, since it uses less digits than its factorization.

16667661685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5988.

The product of its digits is 13063680, while the sum is 58.

The spelling of 16667661685 in words is "sixteen billion, six hundred sixty-seven million, six hundred sixty-one thousand, six hundred eighty-five".