166665166670 has 32 divisors (see below), whose sum is σ = 302400000000. Its totient is φ = 66133738656.

The previous prime is 166665166651. The next prime is 166665166751. The reversal of 166665166670 is 76661566661.

166665166670 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×166665166670² (a number of 23 digits) contains 22 as substring.

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, 733331 + ... + 933329.

It is an arithmetic number, because the mean of its divisors is an integer number (9450000000).

Almost surely, 2^166665166670 is an apocalyptic number.

166665166670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166665166670 is the 333332-nd pentagonal number.

166665166670 is a deficient number, since it is larger than the sum of its proper divisors (135734833330).

166665166670 is a wasteful number, since it uses less digits than its factorization.

166665166670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200672.

The product of its (nonzero) digits is 9797760, while the sum is 56.

The spelling of 166665166670 in words is "one hundred sixty-six billion, six hundred sixty-five million, one hundred sixty-six thousand, six hundred seventy".