2191959366919 has 6 divisors (see below), whose sum is σ = 2549830284024. Its totient is φ = 1878822314460.

The previous prime is 2191959366899. The next prime is 2191959366929. The reversal of 2191959366919 is 9196639591912.

It is not a de Polignac number, because 2191959366919 - 2⁹ = 2191959366407 is a prime.

It is a super-2 number, since 2×2191959366919² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191959366929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22366932267 + ... + 22366932364.

It is an arithmetic number, because the mean of its divisors is an integer number (424971714004).

Almost surely, 2^{2191959366919} is an apocalyptic number.

2191959366919 is the 854783-rd hex number.

2191959366919 is a deficient number, since it is larger than the sum of its proper divisors (357870917105).

2191959366919 is an equidigital number, since it uses as much as digits as its factorization.

2191959366919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44733864645 (or 44733864638 counting only the distinct ones).

The product of its digits is 63772920, while the sum is 70.

The spelling of 2191959366919 in words is "two trillion, one hundred ninety-one billion, nine hundred fifty-nine million, three hundred sixty-six thousand, nine hundred nineteen".