91665967698 has 48 divisors (see below), whose sum is σ = 199487127840. Its totient is φ = 30420551808.

The previous prime is 91665967697. The next prime is 91665967717. The reversal of 91665967698 is 89676956619.

It is not an unprimeable number, because it can be changed into a prime (91665967693) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5002938 + ... + 5021226.

It is an arithmetic number, because the mean of its divisors is an integer number (4155981830).

Almost surely, 2^91665967698 is an apocalyptic number.

91665967698 is an abundant number, since it is smaller than the sum of its proper divisors (107821160142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91665967698 is a wasteful number, since it uses less digits than its factorization.

91665967698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19511 (or 19508 counting only the distinct ones).

The product of its digits is 264539520, while the sum is 72.

The spelling of 91665967698 in words is "ninety-one billion, six hundred sixty-five million, nine hundred sixty-seven thousand, six hundred ninety-eight".