16666870166687 has 32 divisors (see below), whose sum is σ = 18519916584960. Its totient is φ = 14899426174080.

The previous prime is 16666870166671. The next prime is 16666870166707. The reversal of 16666870166687 is 78666107866661.

16666870166687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16666870166687 - 2⁴ = 16666870166671 is a prime.

It is a super-2 number, since 2×16666870166687² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666870166887) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90361364 + ... + 90545622.

It is an arithmetic number, because the mean of its divisors is an integer number (578747393280).

Almost surely, 2^{16666870166687} is an apocalyptic number.

16666870166687 is a deficient number, since it is larger than the sum of its proper divisors (1853046418273).

16666870166687 is a wasteful number, since it uses less digits than its factorization.

16666870166687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185183.

The product of its (nonzero) digits is 877879296, while the sum is 74.

The spelling of 16666870166687 in words is "sixteen trillion, six hundred sixty-six billion, eight hundred seventy million, one hundred sixty-six thousand, six hundred eighty-seven".