91689181775 has 6 divisors (see below), whose sum is σ = 113694585432. Its totient is φ = 73351345400.

The previous prime is 91689181763. The next prime is 91689181789. The reversal of 91689181775 is 57718198619.

It is not a de Polignac number, because 91689181775 - 2¹⁴ = 91689165391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1833783611 + ... + 1833783660.

It is an arithmetic number, because the mean of its divisors is an integer number (18949097572).

Almost surely, 2^91689181775 is an apocalyptic number.

91689181775 is a deficient number, since it is larger than the sum of its proper divisors (22005403657).

91689181775 is a wasteful number, since it uses less digits than its factorization.

91689181775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3667567281 (or 3667567276 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 62.

The spelling of 91689181775 in words is "ninety-one billion, six hundred eighty-nine million, one hundred eighty-one thousand, seven hundred seventy-five".