695559661 has 2 divisors, whose sum is σ = 695559662. Its totient is φ = 695559660.

The previous prime is 695559649. The next prime is 695559703. The reversal of 695559661 is 166955596.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 592922500 + 102637161 = 24350^2 + 10131^2 .

It is a cyclic number.

It is not a de Polignac number, because 695559661 - 2¹¹ = 695557613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 695559599 and 695559608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (695539661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347779830 + 347779831.

It is an arithmetic number, because the mean of its divisors is an integer number (347779831).

Almost surely, 2^695559661 is an apocalyptic number.

It is an amenable number.

695559661 is a deficient number, since it is larger than the sum of its proper divisors (1).

695559661 is an equidigital number, since it uses as much as digits as its factorization.

695559661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2187000, while the sum is 52.

The square root of 695559661 is about 26373.4650927784. The cubic root of 695559661 is about 886.0225918957.

The spelling of 695559661 in words is "six hundred ninety-five million, five hundred fifty-nine thousand, six hundred sixty-one".