25561723 has 4 divisors (see below), whose sum is σ = 27885528. Its totient is φ = 23237920.

The previous prime is 25561687. The next prime is 25561729. The reversal of 25561723 is 32716552.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25561723 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (25561729) 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, 1161886 + ... + 1161907.

It is an arithmetic number, because the mean of its divisors is an integer number (6971382).

Almost surely, 2^25561723 is an apocalyptic number.

25561723 is a deficient number, since it is larger than the sum of its proper divisors (2323805).

25561723 is a wasteful number, since it uses less digits than its factorization.

25561723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323804.

The product of its digits is 12600, while the sum is 31.

The square root of 25561723 is about 5055.8602631006. The cubic root of 25561723 is about 294.5755573776.

The spelling of 25561723 in words is "twenty-five million, five hundred sixty-one thousand, seven hundred twenty-three".