16666851685 has 16 divisors (see below), whose sum is σ = 21964867200. Its totient is φ = 12039989440.

The previous prime is 16666851673. The next prime is 16666851689. The reversal of 16666851685 is 58615866661.

It is not a de Polignac number, because 16666851685 - 2¹³ = 16666843493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666851689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1008697 + ... + 1025086.

It is an arithmetic number, because the mean of its divisors is an integer number (1372804200).

Almost surely, 2^16666851685 is an apocalyptic number.

It is an amenable number.

16666851685 is a deficient number, since it is larger than the sum of its proper divisors (5298015515).

16666851685 is a wasteful number, since it uses less digits than its factorization.

16666851685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2033948.

The product of its digits is 12441600, while the sum is 58.

The spelling of 16666851685 in words is "sixteen billion, six hundred sixty-six million, eight hundred fifty-one thousand, six hundred eighty-five".