91804394501568 has 168 divisors, whose sum is σ = 300797001554400. Its totient is φ = 26224179609600.

The previous prime is 91804394501551. The next prime is 91804394501587. The reversal of 91804394501568 is 86510549340819.

91804394501568 is a `hidden beast` number, since 9 + 1 + 8 + 0 + 439 + 45 + 0 + 156 + 8 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 16295968 + ... + 21193568.

Almost surely, 2^{91804394501568} 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 91804394501568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150398500777200).

91804394501568 is an abundant number, since it is smaller than the sum of its proper divisors (208992607052832).

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

91804394501568 is a wasteful number, since it uses less digits than its factorization.

91804394501568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4902275 (or 4902262 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 63.

The spelling of 91804394501568 in words is "ninety-one trillion, eight hundred four billion, three hundred ninety-four million, five hundred one thousand, five hundred sixty-eight".