2191095840478 has 32 divisors (see below), whose sum is σ = 3444012432000. Its totient is φ = 1044093041376.

The previous prime is 2191095840407. The next prime is 2191095840491. The reversal of 2191095840478 is 8740485901912.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5203473 + ... + 5608771.

It is an arithmetic number, because the mean of its divisors is an integer number (107625388500).

Almost surely, 2^{2191095840478} is an apocalyptic number.

2191095840478 is a deficient number, since it is larger than the sum of its proper divisors (1252916591522).

2191095840478 is a wasteful number, since it uses less digits than its factorization.

2191095840478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406536.

The product of its (nonzero) digits is 5806080, while the sum is 58.

The spelling of 2191095840478 in words is "two trillion, one hundred ninety-one billion, ninety-five million, eight hundred forty thousand, four hundred seventy-eight".