166855541 has 4 divisors (see below), whose sum is σ = 166984512. Its totient is φ = 166726572.

The previous prime is 166855537. The next prime is 166855553. The reversal of 166855541 is 145558661.

166855541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166855541 - 2² = 166855537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166855141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62525 + ... + 65138.

It is an arithmetic number, because the mean of its divisors is an integer number (41746128).

Almost surely, 2^166855541 is an apocalyptic number.

It is an amenable number.

166855541 is a deficient number, since it is larger than the sum of its proper divisors (128971).

166855541 is a wasteful number, since it uses less digits than its factorization.

166855541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128970.

The product of its digits is 144000, while the sum is 41.

The square root of 166855541 is about 12917.2574875629. The cubic root of 166855541 is about 550.5290127736.

The spelling of 166855541 in words is "one hundred sixty-six million, eight hundred fifty-five thousand, five hundred forty-one".