91111658697 has 12 divisors (see below), whose sum is σ = 131608410180. Its totient is φ = 60739868448.

The previous prime is 91111658633. The next prime is 91111658707. The reversal of 91111658697 is 79685611119.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 55816897536 + 35294761161 = 236256^2 + 187869^2 .

It is not a de Polignac number, because 91111658697 - 2⁶ = 91111658633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91111657697) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 662179 + ... + 787847.

It is an arithmetic number, because the mean of its divisors is an integer number (10967367515).

Almost surely, 2^91111658697 is an apocalyptic number.

It is an amenable number.

91111658697 is a deficient number, since it is larger than the sum of its proper divisors (40496751483).

91111658697 is a wasteful number, since it uses less digits than its factorization.

91111658697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206232 (or 206229 counting only the distinct ones).

The product of its digits is 816480, while the sum is 54.

The spelling of 91111658697 in words is "ninety-one billion, one hundred eleven million, six hundred fifty-eight thousand, six hundred ninety-seven".