166865265441 has 24 divisors (see below), whose sum is σ = 278187459264. Its totient is φ = 94407501600.

The previous prime is 166865265431. The next prime is 166865265499. The reversal of 166865265441 is 144562568661.

166865265441 is a `hidden beast` number, since 1 + 6 + 68 + 6 + 526 + 54 + 4 + 1 = 666.

It is not a de Polignac number, because 166865265441 - 2⁵ = 166865265409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166865265431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13105791 + ... + 13118516.

It is an arithmetic number, because the mean of its divisors is an integer number (11591144136).

Almost surely, 2^166865265441 is an apocalyptic number.

It is an amenable number.

166865265441 is a deficient number, since it is larger than the sum of its proper divisors (111322193823).

166865265441 is a wasteful number, since it uses less digits than its factorization.

166865265441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26224421 (or 26224418 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 54.

The spelling of 166865265441 in words is "one hundred sixty-six billion, eight hundred sixty-five million, two hundred sixty-five thousand, four hundred forty-one".