15565 has 8 divisors (see below), whose sum is σ = 20448. Its totient is φ = 11280.

The previous prime is 15559. The next prime is 15569. The reversal of 15565 is 56551.

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

It is not a de Polignac number, because 15565 - 2⁹ = 15053 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15569) 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, 87 + ... + 196.

It is an arithmetic number, because the mean of its divisors is an integer number (2556).

2¹⁵⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

15565 is a deficient number, since it is larger than the sum of its proper divisors (4883).

15565 is a wasteful number, since it uses less digits than its factorization.

15565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299.

The product of its digits is 750, while the sum is 22.

The square root of 15565 is about 124.7597691566. The cubic root of 15565 is about 24.9679589524.

The spelling of 15565 in words is "fifteen thousand, five hundred sixty-five".