91330185606 has 128 divisors (see below), whose sum is σ = 212746383360. Its totient is φ = 25846531200.

The previous prime is 91330185533. The next prime is 91330185607. The reversal of 91330185606 is 60658103319.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91330185607) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 77332336 + ... + 77333516.

It is an arithmetic number, because the mean of its divisors is an integer number (1662081120).

Almost surely, 2^91330185606 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91330185606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106373191680).

91330185606 is an abundant number, since it is smaller than the sum of its proper divisors (121416197754).

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

91330185606 is a wasteful number, since it uses less digits than its factorization.

91330185606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042.

The product of its (nonzero) digits is 116640, while the sum is 42.

The spelling of 91330185606 in words is "ninety-one billion, three hundred thirty million, one hundred eighty-five thousand, six hundred six".