40666445 has 4 divisors (see below), whose sum is σ = 48799740. Its totient is φ = 32533152.

The previous prime is 40666427. The next prime is 40666453. The reversal of 40666445 is 54466604.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6817321 + 33849124 = 2611^2 + 5818^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40666445 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4066640 + ... + 4066649.

It is an arithmetic number, because the mean of its divisors is an integer number (12199935).

Almost surely, 2^40666445 is an apocalyptic number.

It is an amenable number.

40666445 is a deficient number, since it is larger than the sum of its proper divisors (8133295).

40666445 is an equidigital number, since it uses as much as digits as its factorization.

40666445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8133294.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 40666445 is about 6377.0247764926. The cubic root of 40666445 is about 343.8840790458.

The spelling of 40666445 in words is "forty million, six hundred sixty-six thousand, four hundred forty-five".