166041261 has 24 divisors (see below), whose sum is σ = 255662784. Its totient is φ = 103478400.

The previous prime is 166041241. The next prime is 166041263. The reversal of 166041261 is 162140661.

It is not a de Polignac number, because 166041261 - 2⁵ = 166041229 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166041263) 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, 19510 + ... + 26696.

It is an arithmetic number, because the mean of its divisors is an integer number (10652616).

Almost surely, 2^166041261 is an apocalyptic number.

It is an amenable number.

166041261 is a deficient number, since it is larger than the sum of its proper divisors (89621523).

166041261 is a wasteful number, since it uses less digits than its factorization.

166041261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7361 (or 7358 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 166041261 is about 12885.6998645786. The cubic root of 166041261 is about 549.6319973521.

The spelling of 166041261 in words is "one hundred sixty-six million, forty-one thousand, two hundred sixty-one".