40661645399 has 2 divisors, whose sum is σ = 40661645400. Its totient is φ = 40661645398.

The previous prime is 40661645369. The next prime is 40661645413. The reversal of 40661645399 is 99354616604.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40661645399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40661645399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40661645359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20330822699 + 20330822700.

It is an arithmetic number, because the mean of its divisors is an integer number (20330822700).

Almost surely, 2^40661645399 is an apocalyptic number.

40661645399 is a deficient number, since it is larger than the sum of its proper divisors (1).

40661645399 is an equidigital number, since it uses as much as digits as its factorization.

40661645399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4199040, while the sum is 53.

The spelling of 40661645399 in words is "forty billion, six hundred sixty-one million, six hundred forty-five thousand, three hundred ninety-nine".