399996660610447 has 2 divisors, whose sum is σ = 399996660610448. Its totient is φ = 399996660610446.

The previous prime is 399996660610423. The next prime is 399996660610531. The reversal of 399996660610447 is 744016066699993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399996660610447 - 2¹¹ = 399996660608399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399996660619447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199998330305223 + 199998330305224.

It is an arithmetic number, because the mean of its divisors is an integer number (199998330305224).

Almost surely, 2^{399996660610447} is an apocalyptic number.

399996660610447 is a deficient number, since it is larger than the sum of its proper divisors (1).

399996660610447 is an equidigital number, since it uses as much as digits as its factorization.

399996660610447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2857026816, while the sum is 79.

The spelling of 399996660610447 in words is "three hundred ninety-nine trillion, nine hundred ninety-six billion, six hundred sixty million, six hundred ten thousand, four hundred forty-seven".