91178916992 has 64 divisors (see below), whose sum is σ = 192027607200. Its totient is φ = 43004381184.

The previous prime is 91178916991. The next prime is 91178917003. The reversal of 91178916992 is 29961987119.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (91178916991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 486203 + ... + 647109.

Almost surely, 2^91178916992 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 91178916992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96013803600).

91178916992 is an abundant number, since it is smaller than the sum of its proper divisors (100848690208).

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

91178916992 is a wasteful number, since it uses less digits than its factorization.

91178916992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161173 (or 161161 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 62.

The spelling of 91178916992 in words is "ninety-one billion, one hundred seventy-eight million, nine hundred sixteen thousand, nine hundred ninety-two".