816945897967 has 2 divisors, whose sum is σ = 816945897968. Its totient is φ = 816945897966.

The previous prime is 816945897961. The next prime is 816945897979. The reversal of 816945897967 is 769798549618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 816945897967 - 2²³ = 816937509359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816945897961) 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, 408472948983 + 408472948984.

It is an arithmetic number, because the mean of its divisors is an integer number (408472948984).

Almost surely, 2^816945897967 is an apocalyptic number.

816945897967 is a deficient number, since it is larger than the sum of its proper divisors (1).

816945897967 is an equidigital number, since it uses as much as digits as its factorization.

816945897967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1646023680, while the sum is 79.

The spelling of 816945897967 in words is "eight hundred sixteen billion, nine hundred forty-five million, eight hundred ninety-seven thousand, nine hundred sixty-seven".