91867816559 has 2 divisors, whose sum is σ = 91867816560. Its totient is φ = 91867816558.

The previous prime is 91867816549. The next prime is 91867816567. The reversal of 91867816559 is 95561876819.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91867816559 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 91867816495 and 91867816504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91867816549) 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, 45933908279 + 45933908280.

It is an arithmetic number, because the mean of its divisors is an integer number (45933908280).

Almost surely, 2^91867816559 is an apocalyptic number.

91867816559 is a deficient number, since it is larger than the sum of its proper divisors (1).

91867816559 is an equidigital number, since it uses as much as digits as its factorization.

91867816559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32659200, while the sum is 65.

The spelling of 91867816559 in words is "ninety-one billion, eight hundred sixty-seven million, eight hundred sixteen thousand, five hundred fifty-nine".