166863170385 has 24 divisors (see below), whose sum is σ = 289242493800. Its totient is φ = 88989691392.

The previous prime is 166863170371. The next prime is 166863170393. The reversal of 166863170385 is 583071368661.

166863170385 is a `hidden beast` number, since 16 + 6 + 86 + 3 + 170 + 385 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 11935125504 + 154928044881 = 109248^2 + 393609^2 .

It is not a de Polignac number, because 166863170385 - 2⁶ = 166863170321 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1120107 + ... + 1260303.

It is an arithmetic number, because the mean of its divisors is an integer number (12051770575).

Almost surely, 2^166863170385 is an apocalyptic number.

166863170385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166863170385 is a deficient number, since it is larger than the sum of its proper divisors (122379323415).

166863170385 is a wasteful number, since it uses less digits than its factorization.

166863170385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166657 (or 166654 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 166863170385 in words is "one hundred sixty-six billion, eight hundred sixty-three million, one hundred seventy thousand, three hundred eighty-five".