475299661 has 2 divisors, whose sum is σ = 475299662. Its totient is φ = 475299660.

The previous prime is 475299557. The next prime is 475299667. The reversal of 475299661 is 166992574.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 264875625 + 210424036 = 16275^2 + 14506^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-475299661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (475299667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237649830 + 237649831.

It is an arithmetic number, because the mean of its divisors is an integer number (237649831).

Almost surely, 2^475299661 is an apocalyptic number.

It is an amenable number.

475299661 is a deficient number, since it is larger than the sum of its proper divisors (1).

475299661 is an equidigital number, since it uses as much as digits as its factorization.

475299661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 475299661 is about 21801.3683286164. The cubic root of 475299661 is about 780.4094174306.

The spelling of 475299661 in words is "four hundred seventy-five million, two hundred ninety-nine thousand, six hundred sixty-one".