166688415287855 has 8 divisors (see below), whose sum is σ = 201300149928192. Its totient is φ = 132501364508448.

The previous prime is 166688415287839. The next prime is 166688415287917. The reversal of 166688415287855 is 558782514886661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166688415287855 - 2⁴ = 166688415287839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166688415287855.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106170964367 + ... + 106170965936.

It is an arithmetic number, because the mean of its divisors is an integer number (25162518741024).

Almost surely, 2^{166688415287855} is an apocalyptic number.

166688415287855 is a deficient number, since it is larger than the sum of its proper divisors (34611734640337).

166688415287855 is a wasteful number, since it uses less digits than its factorization.

166688415287855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212341930465.

The product of its digits is 6193152000, while the sum is 80.

The spelling of 166688415287855 in words is "one hundred sixty-six trillion, six hundred eighty-eight billion, four hundred fifteen million, two hundred eighty-seven thousand, eight hundred fifty-five".