6440242111 has 2 divisors, whose sum is σ = 6440242112. Its totient is φ = 6440242110.

The previous prime is 6440242097. The next prime is 6440242117. The reversal of 6440242111 is 1112420446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6440242111 - 2²⁷ = 6306024383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6440242117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220121055 + 3220121056.

It is an arithmetic number, because the mean of its divisors is an integer number (3220121056).

Almost surely, 2^6440242111 is an apocalyptic number.

6440242111 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440242111 is an equidigital number, since it uses as much as digits as its factorization.

6440242111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 6440242111 is about 80251.1190638486. The cubic root of 6440242111 is about 1860.5188084302.

Adding to 6440242111 its reverse (1112420446), we get a palindrome (7552662557).

The spelling of 6440242111 in words is "six billion, four hundred forty million, two hundred forty-two thousand, one hundred eleven".