705644640691 has 2 divisors, whose sum is σ = 705644640692. Its totient is φ = 705644640690.

The previous prime is 705644640677. The next prime is 705644640703. The reversal of 705644640691 is 196046446507.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 705644640691 - 2⁹ = 705644640179 is a prime.

It is not a weakly prime, because it can be changed into another prime (705644640611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352822320345 + 352822320346.

It is an arithmetic number, because the mean of its divisors is an integer number (352822320346).

Almost surely, 2^705644640691 is an apocalyptic number.

705644640691 is a deficient number, since it is larger than the sum of its proper divisors (1).

705644640691 is an equidigital number, since it uses as much as digits as its factorization.

705644640691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 705644640691 in words is "seven hundred five billion, six hundred forty-four million, six hundred forty thousand, six hundred ninety-one".