245665 has 8 divisors (see below), whose sum is σ = 336960. Its totient is φ = 168432.

The previous prime is 245653. The next prime is 245671. The reversal of 245665 is 566542.

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

It is a cyclic number.

It is not a de Polignac number, because 245665 - 2¹⁵ = 212897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3475 + ... + 3544.

It is an arithmetic number, because the mean of its divisors is an integer number (42120).

2²⁴⁵⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

245665 is a deficient number, since it is larger than the sum of its proper divisors (91295).

245665 is an equidigital number, since it uses as much as digits as its factorization.

245665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7031.

The product of its digits is 7200, while the sum is 28.

The square root of 245665 is about 495.6460430590. The cubic root of 245665 is about 62.6298102023.

The spelling of 245665 in words is "two hundred forty-five thousand, six hundred sixty-five".