207255661 has 2 divisors, whose sum is σ = 207255662. Its totient is φ = 207255660.

The previous prime is 207255649. The next prime is 207255689. The reversal of 207255661 is 166552702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153512100 + 53743561 = 12390^2 + 7331^2 .

It is a cyclic number.

It is not a de Polignac number, because 207255661 - 2⁹ = 207255149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (207255161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103627830 + 103627831.

It is an arithmetic number, because the mean of its divisors is an integer number (103627831).

Almost surely, 2^207255661 is an apocalyptic number.

It is an amenable number.

207255661 is a deficient number, since it is larger than the sum of its proper divisors (1).

207255661 is an equidigital number, since it uses as much as digits as its factorization.

207255661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 207255661 is about 14396.3766622022. The cubic root of 207255661 is about 591.7916056814.

The spelling of 207255661 in words is "two hundred seven million, two hundred fifty-five thousand, six hundred sixty-one".