2705440643 has 2 divisors, whose sum is σ = 2705440644. Its totient is φ = 2705440642.

The previous prime is 2705440631. The next prime is 2705440657. The reversal of 2705440643 is 3460445072.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2705440643 - 2⁴ = 2705440627 is a prime.

It is not a weakly prime, because it can be changed into another prime (2705440613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1352720321 + 1352720322.

It is an arithmetic number, because the mean of its divisors is an integer number (1352720322).

Almost surely, 2^2705440643 is an apocalyptic number.

2705440643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2705440643 is an equidigital number, since it uses as much as digits as its factorization.

2705440643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 35.

The square root of 2705440643 is about 52013.8504919603. The cubic root of 2705440643 is about 1393.4113272899.

The spelling of 2705440643 in words is "two billion, seven hundred five million, four hundred forty thousand, six hundred forty-three".