25745561 has 8 divisors (see below), whose sum is σ = 26136000. Its totient is φ = 25358320.

The previous prime is 25745557. The next prime is 25745563. The reversal of 25745561 is 16554752.

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

It is a cyclic number.

It is not a de Polignac number, because 25745561 - 2² = 25745557 is a prime.

It is a super-2 number, since 2×25745561² = 1325667822409442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25745563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18860 + ... + 20178.

It is an arithmetic number, because the mean of its divisors is an integer number (3267000).

Almost surely, 2^25745561 is an apocalyptic number.

It is an amenable number.

25745561 is a deficient number, since it is larger than the sum of its proper divisors (390439).

25745561 is a wasteful number, since it uses less digits than its factorization.

25745561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1599.

The product of its digits is 42000, while the sum is 35.

The square root of 25745561 is about 5074.0083760278. The cubic root of 25745561 is about 295.2800596169.

The spelling of 25745561 in words is "twenty-five million, seven hundred forty-five thousand, five hundred sixty-one".