91774516680 has 1728 divisors, whose sum is σ = 420072307200. Its totient is φ = 17244057600.

The previous prime is 91774516679. The next prime is 91774516709. The reversal of 91774516680 is 8661547719.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 431 ways as a sum of consecutive naturals, for example, 1257185124 + ... + 1257185196.

It is an arithmetic number, because the mean of its divisors is an integer number (243097400).

Almost surely, 2^91774516680 is an apocalyptic number.

91774516680 is a gapful number since it is divisible by the number (90) 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 91774516680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210036153600).

91774516680 is an abundant number, since it is smaller than the sum of its proper divisors (328297790520).

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

91774516680 is a wasteful number, since it uses less digits than its factorization.

91774516680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 91774516680 in words is "ninety-one billion, seven hundred seventy-four million, five hundred sixteen thousand, six hundred eighty".