91344236544 has 520 divisors, whose sum is σ = 301805192832. Its totient is φ = 27411333120.

The previous prime is 91344236531. The next prime is 91344236563. The reversal of 91344236544 is 44563244319.

91344236544 is a `hidden beast` number, since 9 + 1 + 34 + 42 + 36 + 544 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 91344236544.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 886837197 + ... + 886837299.

Almost surely, 2^91344236544 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 91344236544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150902596416).

91344236544 is an abundant number, since it is smaller than the sum of its proper divisors (210460956288).

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

91344236544 is an frugal number, since it uses more digits than its factorization.

91344236544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 119 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 45.

The spelling of 91344236544 in words is "ninety-one billion, three hundred forty-four million, two hundred thirty-six thousand, five hundred forty-four".