91665191912320 has 192 divisors, whose sum is σ = 237660836289840. Its totient is φ = 33792782499840.

The previous prime is 91665191912209. The next prime is 91665191912351. The reversal of 91665191912320 is 2321919156619.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68669487 + ... + 69991633.

Almost surely, 2^{91665191912320} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91665191912320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118830418144920).

91665191912320 is an abundant number, since it is smaller than the sum of its proper divisors (145995644377520).

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

91665191912320 is a wasteful number, since it uses less digits than its factorization.

91665191912320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322833 (or 1322808 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 55.

The spelling of 91665191912320 in words is "ninety-one trillion, six hundred sixty-five billion, one hundred ninety-one million, nine hundred twelve thousand, three hundred twenty".