705507661 has 2 divisors, whose sum is σ = 705507662. Its totient is φ = 705507660.

The previous prime is 705507659. The next prime is 705507689. The reversal of 705507661 is 166705507.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 620757225 + 84750436 = 24915^2 + 9206^2 .

It is a cyclic number.

It is not a de Polignac number, because 705507661 - 2¹ = 705507659 is a prime.

Together with 705507659, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 705507661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (705507611) 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, 352753830 + 352753831.

It is an arithmetic number, because the mean of its divisors is an integer number (352753831).

Almost surely, 2^705507661 is an apocalyptic number.

It is an amenable number.

705507661 is a deficient number, since it is larger than the sum of its proper divisors (1).

705507661 is an equidigital number, since it uses as much as digits as its factorization.

705507661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 705507661 is about 26561.3941840409. The cubic root of 705507661 is about 890.2266228434.

The spelling of 705507661 in words is "seven hundred five million, five hundred seven thousand, six hundred sixty-one".