445666993391 has 2 divisors, whose sum is σ = 445666993392. Its totient is φ = 445666993390.

The previous prime is 445666993379. The next prime is 445666993399. The reversal of 445666993391 is 193399666544.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 445666993391 - 2¹⁸ = 445666731247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (445666993399) 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, 222833496695 + 222833496696.

It is an arithmetic number, because the mean of its divisors is an integer number (222833496696).

Almost surely, 2^445666993391 is an apocalyptic number.

445666993391 is a deficient number, since it is larger than the sum of its proper divisors (1).

445666993391 is an equidigital number, since it uses as much as digits as its factorization.

445666993391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113374080, while the sum is 65.

The spelling of 445666993391 in words is "four hundred forty-five billion, six hundred sixty-six million, nine hundred ninety-three thousand, three hundred ninety-one".