40006663 has 2 divisors, whose sum is σ = 40006664. Its totient is φ = 40006662.

The previous prime is 40006621. The next prime is 40006697. The reversal of 40006663 is 36660004.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40006663 - 2²¹ = 37909511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40006063) 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 as a sum of consecutive naturals, namely, 20003331 + 20003332.

It is an arithmetic number, because the mean of its divisors is an integer number (20003332).

Almost surely, 2^40006663 is an apocalyptic number.

40006663 is a deficient number, since it is larger than the sum of its proper divisors (1).

40006663 is an equidigital number, since it uses as much as digits as its factorization.

40006663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 40006663 is about 6325.0820548037. The cubic root of 40006663 is about 342.0141775639.

Adding to 40006663 its reverse (36660004), we get a palindrome (76666667).

The spelling of 40006663 in words is "forty million, six thousand, six hundred sixty-three".