91497319776 has 144 divisors (see below), whose sum is σ = 262656798768. Its totient is φ = 30211584000.

The previous prime is 91497319763. The next prime is 91497319787. The reversal of 91497319776 is 67791379419.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20554351 + ... + 20558801.

It is an arithmetic number, because the mean of its divisors is an integer number (1824005547).

Almost surely, 2^91497319776 is an apocalyptic number.

91497319776 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 91497319776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131328399384).

91497319776 is an abundant number, since it is smaller than the sum of its proper divisors (171159478992).

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

91497319776 is a wasteful number, since it uses less digits than its factorization.

91497319776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5125 (or 5114 counting only the distinct ones).

The product of its digits is 18003384, while the sum is 63.

The spelling of 91497319776 in words is "ninety-one billion, four hundred ninety-seven million, three hundred nineteen thousand, seven hundred seventy-six".