40664171 has 4 divisors (see below), whose sum is σ = 40833144. Its totient is φ = 40495200.

The previous prime is 40664101. The next prime is 40664179. The reversal of 40664171 is 17146604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40664171 - 2¹⁸ = 40402027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40664179) 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, 84125 + ... + 84606.

It is an arithmetic number, because the mean of its divisors is an integer number (10208286).

Almost surely, 2^40664171 is an apocalyptic number.

40664171 is a deficient number, since it is larger than the sum of its proper divisors (168973).

40664171 is a wasteful number, since it uses less digits than its factorization.

40664171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168972.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 40664171 is about 6376.8464776879. The cubic root of 40664171 is about 343.8776691176.

The spelling of 40664171 in words is "forty million, six hundred sixty-four thousand, one hundred seventy-one".