245661 has 8 divisors (see below), whose sum is σ = 352800. Its totient is φ = 151152.

The previous prime is 245653. The next prime is 245671. The reversal of 245661 is 166542.

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

It is not a de Polignac number, because 245661 - 2³ = 245653 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 245661.

It is not an unprimeable number, because it can be changed into a prime (245621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3111 + ... + 3188.

It is an arithmetic number, because the mean of its divisors is an integer number (44100).

2²⁴⁵⁶⁶¹ is an apocalyptic number.

It is an amenable number.

245661 is a deficient number, since it is larger than the sum of its proper divisors (107139).

245661 is a wasteful number, since it uses less digits than its factorization.

245661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6315.

The product of its digits is 1440, while the sum is 24.

The square root of 245661 is about 495.6420079049. The cubic root of 245661 is about 62.6294702806.

The spelling of 245661 in words is "two hundred forty-five thousand, six hundred sixty-one".