91804543667 has 2 divisors, whose sum is σ = 91804543668. Its totient is φ = 91804543666.

The previous prime is 91804543657. The next prime is 91804543687. The reversal of 91804543667 is 76634540819.

It is a weak prime.

It is an emirp because it is prime and its reverse (76634540819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91804543667 - 2⁶ = 91804543603 is a prime.

It is a super-2 number, since 2×91804543667² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91804543627) 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, 45902271833 + 45902271834.

It is an arithmetic number, because the mean of its divisors is an integer number (45902271834).

Almost surely, 2^91804543667 is an apocalyptic number.

91804543667 is a deficient number, since it is larger than the sum of its proper divisors (1).

91804543667 is an equidigital number, since it uses as much as digits as its factorization.

91804543667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 91804543667 in words is "ninety-one billion, eight hundred four million, five hundred forty-three thousand, six hundred sixty-seven".