40645663 has 2 divisors, whose sum is σ = 40645664. Its totient is φ = 40645662.

The previous prime is 40645651. The next prime is 40645711. The reversal of 40645663 is 36654604.

40645663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40645663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40645643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20322831 + 20322832.

It is an arithmetic number, because the mean of its divisors is an integer number (20322832).

Almost surely, 2^40645663 is an apocalyptic number.

40645663 is a deficient number, since it is larger than the sum of its proper divisors (1).

40645663 is an equidigital number, since it uses as much as digits as its factorization.

40645663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 40645663 is about 6375.3951250099. The cubic root of 40645663 is about 343.8254900652.

The spelling of 40645663 in words is "forty million, six hundred forty-five thousand, six hundred sixty-three".