166865961 has 8 divisors (see below), whose sum is σ = 234197920. Its totient is φ = 105388992.

The previous prime is 166865957. The next prime is 166865969. The reversal of 166865961 is 169568661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166865961 - 2² = 166865957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166865961.

It is not an unprimeable number, because it can be changed into a prime (166865969) 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 7 ways as a sum of consecutive naturals, for example, 1463680 + ... + 1463793.

It is an arithmetic number, because the mean of its divisors is an integer number (29274740).

Almost surely, 2^166865961 is an apocalyptic number.

It is an amenable number.

166865961 is a deficient number, since it is larger than the sum of its proper divisors (67331959).

166865961 is a wasteful number, since it uses less digits than its factorization.

166865961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2927495.

The product of its digits is 466560, while the sum is 48.

The square root of 166865961 is about 12917.6608176558. The cubic root of 166865961 is about 550.5404725726.

The spelling of 166865961 in words is "one hundred sixty-six million, eight hundred sixty-five thousand, nine hundred sixty-one".