166666782855 has 32 divisors (see below), whose sum is σ = 268324213248. Its totient is φ = 88337174400.

The previous prime is 166666782839. The next prime is 166666782857. The reversal of 166666782855 is 558287666661.

It is not a de Polignac number, because 166666782855 - 2⁴ = 166666782839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166666782857) 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, 4082052 + ... + 4122678.

It is an arithmetic number, because the mean of its divisors is an integer number (8385131664).

Almost surely, 2^166666782855 is an apocalyptic number.

166666782855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166666782855 is a deficient number, since it is larger than the sum of its proper divisors (101657430393).

166666782855 is a wasteful number, since it uses less digits than its factorization.

166666782855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42327.

The product of its digits is 174182400, while the sum is 66.

The spelling of 166666782855 in words is "one hundred sixty-six billion, six hundred sixty-six million, seven hundred eighty-two thousand, eight hundred fifty-five".