991916402567 has 2 divisors, whose sum is σ = 991916402568. Its totient is φ = 991916402566.

The previous prime is 991916402473. The next prime is 991916402627. The reversal of 991916402567 is 765204619199.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991916402567 - 2²² = 991912208263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991916402167) 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, 495958201283 + 495958201284.

It is an arithmetic number, because the mean of its divisors is an integer number (495958201284).

Almost surely, 2^991916402567 is an apocalyptic number.

991916402567 is a deficient number, since it is larger than the sum of its proper divisors (1).

991916402567 is an equidigital number, since it uses as much as digits as its factorization.

991916402567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7348320, while the sum is 59.

The spelling of 991916402567 in words is "nine hundred ninety-one billion, nine hundred sixteen million, four hundred two thousand, five hundred sixty-seven".