252638665 has 8 divisors (see below), whose sum is σ = 303545088. Its totient is φ = 201858480.

The previous prime is 252638641. The next prime is 252638669. The reversal of 252638665 is 566836252.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 252638665 - 2⁹ = 252638153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252638669) 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 in 7 ways as a sum of consecutive naturals, for example, 27097 + ... + 35206.

It is an arithmetic number, because the mean of its divisors is an integer number (37943136).

Almost surely, 2^252638665 is an apocalyptic number.

It is an amenable number.

252638665 is a deficient number, since it is larger than the sum of its proper divisors (50906423).

252638665 is an equidigital number, since it uses as much as digits as its factorization.

252638665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63119.

The product of its digits is 518400, while the sum is 43.

The square root of 252638665 is about 15894.6111937348. The cubic root of 252638665 is about 632.1691124982.

The spelling of 252638665 in words is "two hundred fifty-two million, six hundred thirty-eight thousand, six hundred sixty-five".