91644223442 has 54 divisors (see below), whose sum is σ = 147945158949. Its totient is φ = 42572451680.

The previous prime is 91644223417. The next prime is 91644223453. The reversal of 91644223442 is 24432244619.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 65448477241 + 26195746201 = 255829^2 + 161851^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=214061.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91644223442.

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 26 ways as a sum of consecutive naturals, for example, 403718933 + ... + 403719159.

Almost surely, 2^91644223442 is an apocalyptic number.

91644223442 is a deficient number, since it is larger than the sum of its proper divisors (56300935507).

91644223442 is an equidigital number, since it uses as much as digits as its factorization.

91644223442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584 (or 293 counting only the distinct ones).

The product of its digits is 331776, while the sum is 41.

The spelling of 91644223442 in words is "ninety-one billion, six hundred forty-four million, two hundred twenty-three thousand, four hundred forty-two".