166878159 has 48 divisors (see below), whose sum is σ = 276944640. Its totient is φ = 87264000.

The previous prime is 166878157. The next prime is 166878161. The reversal of 166878159 is 951878661.

It is an interprime number because it is at equal distance from previous prime (166878157) and next prime (166878161).

It is not a de Polignac number, because 166878159 - 2¹ = 166878157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166878157) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1652209 + ... + 1652309.

It is an arithmetic number, because the mean of its divisors is an integer number (5769680).

Almost surely, 2^166878159 is an apocalyptic number.

166878159 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

166878159 is a deficient number, since it is larger than the sum of its proper divisors (110066481).

166878159 is a wasteful number, since it uses less digits than its factorization.

166878159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 171 counting only the distinct ones).

The product of its digits is 725760, while the sum is 51.

The square root of 166878159 is about 12918.1329533335. The cubic root of 166878159 is about 550.5538871900.

The spelling of 166878159 in words is "one hundred sixty-six million, eight hundred seventy-eight thousand, one hundred fifty-nine".