91806918336 has 168 divisors, whose sum is σ = 307139888640. Its totient is φ = 25672398336.

The previous prime is 91806918293. The next prime is 91806918361. The reversal of 91806918336 is 63381960819.

It is a tau number, because it is divible by the number of its divisors (168).

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, 52726 + ... + 431733.

Almost surely, 2^91806918336 is an apocalyptic number.

91806918336 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91806918336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153569944320).

91806918336 is an abundant number, since it is smaller than the sum of its proper divisors (215332970304).

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

91806918336 is a wasteful number, since it uses less digits than its factorization.

91806918336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484531 (or 484518 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 91806918336 in words is "ninety-one billion, eight hundred six million, nine hundred eighteen thousand, three hundred thirty-six".