15565725 has 36 divisors (see below), whose sum is σ = 31866016. Its totient is φ = 7115040.

The previous prime is 15565723. The next prime is 15565741. The reversal of 15565725 is 52756551.

It is a happy number.

It is not a de Polignac number, because 15565725 - 2¹ = 15565723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15565725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15565723) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3367 + ... + 6516.

Almost surely, 2^15565725 is an apocalyptic number.

15565725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15565725 is an abundant number, since it is smaller than the sum of its proper divisors (16300291).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15565725 is a wasteful number, since it uses less digits than its factorization.

15565725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9906 (or 9898 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 15565725 is about 3945.3421904823. The cubic root of 15565725 is about 249.6834660609.

It can be divided in two parts, 15565 and 725, that added together give a triangular number (16290 = T₁₈₀).

The spelling of 15565725 in words is "fifteen million, five hundred sixty-five thousand, seven hundred twenty-five".