635903999947 has 2 divisors, whose sum is σ = 635903999948. Its totient is φ = 635903999946.

The previous prime is 635903999921. The next prime is 635904000007. The reversal of 635903999947 is 749999309536.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 635903999947 - 2¹¹ = 635903997899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 635903999947.

It is not a weakly prime, because it can be changed into another prime (635903999447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317951999973 + 317951999974.

It is an arithmetic number, because the mean of its divisors is an integer number (317951999974).

Almost surely, 2^635903999947 is an apocalyptic number.

635903999947 is a deficient number, since it is larger than the sum of its proper divisors (1).

635903999947 is an equidigital number, since it uses as much as digits as its factorization.

635903999947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 446410440, while the sum is 73.

The spelling of 635903999947 in words is "six hundred thirty-five billion, nine hundred three million, nine hundred ninety-nine thousand, nine hundred forty-seven".