635664243 has 4 divisors (see below), whose sum is σ = 847552328. Its totient is φ = 423776160.

The previous prime is 635664223. The next prime is 635664283. The reversal of 635664243 is 342466536.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 635664243 - 2¹⁶ = 635598707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (635664203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105944038 + ... + 105944043.

It is an arithmetic number, because the mean of its divisors is an integer number (211888082).

Almost surely, 2^635664243 is an apocalyptic number.

635664243 is a deficient number, since it is larger than the sum of its proper divisors (211888085).

635664243 is a wasteful number, since it uses less digits than its factorization.

635664243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211888084.

The product of its digits is 311040, while the sum is 39.

The square root of 635664243 is about 25212.3827315072. The cubic root of 635664243 is about 859.8234011820.

The spelling of 635664243 in words is "six hundred thirty-five million, six hundred sixty-four thousand, two hundred forty-three".