245664609 has 8 divisors (see below), whose sum is σ = 330132480. Its totient is φ = 162486576.

The previous prime is 245664589. The next prime is 245664611. The reversal of 245664609 is 906466542.

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

It is a de Polignac number, because none of the positive numbers 2^k-245664609 is a prime.

It is a super-2 number, since 2×245664609² = 120702200230245762, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (245664619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322014 + ... + 322775.

It is an arithmetic number, because the mean of its divisors is an integer number (41266560).

Almost surely, 2^245664609 is an apocalyptic number.

It is an amenable number.

245664609 is a deficient number, since it is larger than the sum of its proper divisors (84467871).

245664609 is a wasteful number, since it uses less digits than its factorization.

245664609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644919.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 245664609 is about 15673.6916200364. The cubic root of 245664609 is about 626.2977697514.

The spelling of 245664609 in words is "two hundred forty-five million, six hundred sixty-four thousand, six hundred nine".