991703227967 has 2 divisors, whose sum is σ = 991703227968. Its totient is φ = 991703227966.

The previous prime is 991703227919. The next prime is 991703228069. The reversal of 991703227967 is 769722307199.

It is a weak prime.

It is an emirp because it is prime and its reverse (769722307199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 991703227967 - 2⁶ = 991703227903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991703223967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495851613983 + 495851613984.

It is an arithmetic number, because the mean of its divisors is an integer number (495851613984).

Almost surely, 2^991703227967 is an apocalyptic number.

991703227967 is a deficient number, since it is larger than the sum of its proper divisors (1).

991703227967 is an equidigital number, since it uses as much as digits as its factorization.

991703227967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18003384, while the sum is 62.

The spelling of 991703227967 in words is "nine hundred ninety-one billion, seven hundred three million, two hundred twenty-seven thousand, nine hundred sixty-seven".