635948810669 has 2 divisors, whose sum is σ = 635948810670. Its totient is φ = 635948810668.

The previous prime is 635948810633. The next prime is 635948810671. The reversal of 635948810669 is 966018849536.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 621968822500 + 13979988169 = 788650^2 + 118237^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-635948810669 is a prime.

It is a super-2 number, since 2×635948810669² (a number of 24 digits) contains 22 as substring.

Together with 635948810671, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (635948810699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317974405334 + 317974405335.

It is an arithmetic number, because the mean of its divisors is an integer number (317974405335).

Almost surely, 2^635948810669 is an apocalyptic number.

It is an amenable number.

635948810669 is a deficient number, since it is larger than the sum of its proper divisors (1).

635948810669 is an equidigital number, since it uses as much as digits as its factorization.

635948810669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67184640, while the sum is 65.

The spelling of 635948810669 in words is "six hundred thirty-five billion, nine hundred forty-eight million, eight hundred ten thousand, six hundred sixty-nine".