125665 has 8 divisors (see below), whose sum is σ = 154728. Its totient is φ = 97920.

The previous prime is 125659. The next prime is 125669. The reversal of 125665 is 566521.

125665 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 4 ways, for example, as 12769 + 112896 = 113^2 + 336^2 .

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-125665 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125669) 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, 102 + ... + 511.

It is an arithmetic number, because the mean of its divisors is an integer number (19341).

2¹²⁵⁶⁶⁵ is an apocalyptic number.

125665 is the 205-th octagonal number.

It is an amenable number.

125665 is a deficient number, since it is larger than the sum of its proper divisors (29063).

125665 is an equidigital number, since it uses as much as digits as its factorization.

125665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659.

The product of its digits is 1800, while the sum is 25.

The square root of 125665 is about 354.4925951272. The cubic root of 125665 is about 50.0885098942.

The spelling of 125665 in words is "one hundred twenty-five thousand, six hundred sixty-five".