16666685016686 has 4 divisors (see below), whose sum is σ = 25000027525032. Its totient is φ = 8333342508342.

The previous prime is 16666685016671. The next prime is 16666685016691. The reversal of 16666685016686 is 68661058666661.

16666685016686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×16666685016686² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4166671254170 + ... + 4166671254173.

It is an arithmetic number, because the mean of its divisors is an integer number (6250006881258).

Almost surely, 2^{16666685016686} is an apocalyptic number.

16666685016686 is a deficient number, since it is larger than the sum of its proper divisors (8333342508346).

16666685016686 is an equidigital number, since it uses as much as digits as its factorization.

16666685016686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8333342508345.

The product of its (nonzero) digits is 537477120, while the sum is 71.

The spelling of 16666685016686 in words is "sixteen trillion, six hundred sixty-six billion, six hundred eighty-five million, sixteen thousand, six hundred eighty-six".