40666505 has 8 divisors (see below), whose sum is σ = 53236224. Its totient is φ = 29575600.

The previous prime is 40666501. The next prime is 40666511. The reversal of 40666505 is 50566604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40666505 - 2² = 40666501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40666501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369641 + ... + 369750.

It is an arithmetic number, because the mean of its divisors is an integer number (6654528).

Almost surely, 2^40666505 is an apocalyptic number.

It is an amenable number.

40666505 is a deficient number, since it is larger than the sum of its proper divisors (12569719).

40666505 is a wasteful number, since it uses less digits than its factorization.

40666505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739407.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 40666505 is about 6377.0294808790. The cubic root of 40666505 is about 343.8842481699.

Subtracting 40666505 from its reverse (50566604), we obtain a palindrome (9900099).

The spelling of 40666505 in words is "forty million, six hundred sixty-six thousand, five hundred five".