91066559328 has 72 divisors (see below), whose sum is σ = 259048776168. Its totient is φ = 30346348032.

The previous prime is 91066559291. The next prime is 91066559341. The reversal of 91066559328 is 82395566019.

It is a happy number.

91066559328 is a `hidden beast` number, since 9 + 1 + 0 + 66 + 559 + 3 + 28 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 942651 + ... + 1034757.

It is an arithmetic number, because the mean of its divisors is an integer number (3597899669).

Almost surely, 2^91066559328 is an apocalyptic number.

It is an amenable number.

91066559328 is an abundant number, since it is smaller than the sum of its proper divisors (167982216840).

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

91066559328 is a wasteful number, since it uses less digits than its factorization.

91066559328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95556 (or 95545 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The spelling of 91066559328 in words is "ninety-one billion, sixty-six million, five hundred fifty-nine thousand, three hundred twenty-eight".