166891041 has 24 divisors (see below), whose sum is σ = 259665120. Its totient is φ = 102949056.

The previous prime is 166891007. The next prime is 166891051. The reversal of 166891041 is 140198661.

It is a happy number.

It is not a de Polignac number, because 166891041 - 2¹⁴ = 166874657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166890987 and 166891005.

It is not an unprimeable number, because it can be changed into a prime (166891051) 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 23 ways as a sum of consecutive naturals, for example, 3996 + ... + 18701.

It is an arithmetic number, because the mean of its divisors is an integer number (10819380).

Almost surely, 2^166891041 is an apocalyptic number.

It is an amenable number.

166891041 is a deficient number, since it is larger than the sum of its proper divisors (92774079).

166891041 is a wasteful number, since it uses less digits than its factorization.

166891041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22765 (or 22762 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 166891041 is about 12918.6315451754. The cubic root of 166891041 is about 550.5680533192.

The spelling of 166891041 in words is "one hundred sixty-six million, eight hundred ninety-one thousand, forty-one".