166666684870 has 32 divisors (see below), whose sum is σ = 345474429696. Its totient is φ = 56706655200.

The previous prime is 166666684859. The next prime is 166666684871. The reversal of 166666684870 is 78486666661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166666684871) 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, 9078436 + ... + 9096775.

It is an arithmetic number, because the mean of its divisors is an integer number (10796075928).

Almost surely, 2^166666684870 is an apocalyptic number.

166666684870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166666684870 is an abundant number, since it is smaller than the sum of its proper divisors (178807744826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166666684870 is a wasteful number, since it uses less digits than its factorization.

166666684870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18175356.

The product of its (nonzero) digits is 83607552, while the sum is 64.

The spelling of 166666684870 in words is "one hundred sixty-six billion, six hundred sixty-six million, six hundred eighty-four thousand, eight hundred seventy".