166780955 has 32 divisors (see below), whose sum is σ = 231897600. Its totient is φ = 114824160.

The previous prime is 166780951. The next prime is 166780967. The reversal of 166780955 is 559087661.

It is not a de Polignac number, because 166780955 - 2² = 166780951 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166780951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125786 + ... + 127104.

It is an arithmetic number, because the mean of its divisors is an integer number (7246800).

Almost surely, 2^166780955 is an apocalyptic number.

166780955 is a deficient number, since it is larger than the sum of its proper divisors (65116645).

166780955 is a wasteful number, since it uses less digits than its factorization.

166780955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376 (or 1354 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 47.

The square root of 166780955 is about 12914.3700969114. The cubic root of 166780955 is about 550.4469699946.

The spelling of 166780955 in words is "one hundred sixty-six million, seven hundred eighty thousand, nine hundred fifty-five".