2718861643 has 2 divisors, whose sum is σ = 2718861644. Its totient is φ = 2718861642.

The previous prime is 2718861637. The next prime is 2718861661. The reversal of 2718861643 is 3461688172.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2718861643 - 2⁵ = 2718861611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2718861593 and 2718861602.

It is not a weakly prime, because it can be changed into another prime (2718861043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1359430821 + 1359430822.

It is an arithmetic number, because the mean of its divisors is an integer number (1359430822).

Almost surely, 2^2718861643 is an apocalyptic number.

2718861643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2718861643 is an equidigital number, since it uses as much as digits as its factorization.

2718861643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 46.

The square root of 2718861643 is about 52142.7045999726. The cubic root of 2718861643 is about 1395.7116469354.

It can be divided in two parts, 271886 and 1643, that added together give a square (273529 = 523²).

The spelling of 2718861643 in words is "two billion, seven hundred eighteen million, eight hundred sixty-one thousand, six hundred forty-three".