91665967709 has 8 divisors (see below), whose sum is σ = 92530535328. Its totient is φ = 90801546160.

The previous prime is 91665967697. The next prime is 91665967717. The reversal of 91665967709 is 90776956619.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91665967709 - 2⁴ = 91665967693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91665967759) 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 in 7 ways as a sum of consecutive naturals, for example, 1545614 + ... + 1603824.

It is an arithmetic number, because the mean of its divisors is an integer number (11566316916).

Almost surely, 2^91665967709 is an apocalyptic number.

It is an amenable number.

91665967709 is a deficient number, since it is larger than the sum of its proper divisors (864567619).

91665967709 is a wasteful number, since it uses less digits than its factorization.

91665967709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73035.

The product of its (nonzero) digits is 38578680, while the sum is 65.

The spelling of 91665967709 in words is "ninety-one billion, six hundred sixty-five million, nine hundred sixty-seven thousand, seven hundred nine".