15725563 has 4 divisors (see below), whose sum is σ = 17972080. Its totient is φ = 13479048.

The previous prime is 15725557. The next prime is 15725579. The reversal of 15725563 is 36552751.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15725563 - 2⁵ = 15725531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15725513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1123248 + ... + 1123261.

It is an arithmetic number, because the mean of its divisors is an integer number (4493020).

Almost surely, 2^15725563 is an apocalyptic number.

15725563 is a deficient number, since it is larger than the sum of its proper divisors (2246517).

15725563 is an equidigital number, since it uses as much as digits as its factorization.

15725563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246516.

The product of its digits is 31500, while the sum is 34.

The square root of 15725563 is about 3965.5469988389. The cubic root of 15725563 is about 250.5351894714.

It can be divided in two parts, 15 and 725563, that multiplied together give a triangular number (10883445 = T₄₆₆₅).

The spelling of 15725563 in words is "fifteen million, seven hundred twenty-five thousand, five hundred sixty-three".