634253665 has 4 divisors (see below), whose sum is σ = 761104404. Its totient is φ = 507402928.

The previous prime is 634253647. The next prime is 634253671. The reversal of 634253665 is 566352436.

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

It can be written as a sum of positive squares in 2 ways, for example, as 456591424 + 177662241 = 21368^2 + 13329^2 .

It is a cyclic number.

It is not a de Polignac number, because 634253665 - 2¹⁵ = 634220897 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63425362 + ... + 63425371.

It is an arithmetic number, because the mean of its divisors is an integer number (190276101).

Almost surely, 2^634253665 is an apocalyptic number.

It is an amenable number.

634253665 is a deficient number, since it is larger than the sum of its proper divisors (126850739).

634253665 is a wasteful number, since it uses less digits than its factorization.

634253665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126850738.

The product of its digits is 388800, while the sum is 40.

The square root of 634253665 is about 25184.3932823485. The cubic root of 634253665 is about 859.1869298464.

The spelling of 634253665 in words is "six hundred thirty-four million, two hundred fifty-three thousand, six hundred sixty-five".