705990687217 has 2 divisors, whose sum is σ = 705990687218. Its totient is φ = 705990687216.

The previous prime is 705990687169. The next prime is 705990687239. The reversal of 705990687217 is 712786099507.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 612589547761 + 93401139456 = 782681^2 + 305616^2 .

It is a cyclic number.

It is not a de Polignac number, because 705990687217 - 2⁷ = 705990687089 is a prime.

It is not a weakly prime, because it can be changed into another prime (705990687257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352995343608 + 352995343609.

It is an arithmetic number, because the mean of its divisors is an integer number (352995343609).

Almost surely, 2^705990687217 is an apocalyptic number.

It is an amenable number.

705990687217 is a deficient number, since it is larger than the sum of its proper divisors (1).

705990687217 is an equidigital number, since it uses as much as digits as its factorization.

705990687217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13335840, while the sum is 61.

The spelling of 705990687217 in words is "seven hundred five billion, nine hundred ninety million, six hundred eighty-seven thousand, two hundred seventeen".