25661035 has 4 divisors (see below), whose sum is σ = 30793248. Its totient is φ = 20528824.

The previous prime is 25661029. The next prime is 25661071. The reversal of 25661035 is 53016652.

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-25661035 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25660994 and 25661012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2566099 + ... + 2566108.

It is an arithmetic number, because the mean of its divisors is an integer number (7698312).

Almost surely, 2^25661035 is an apocalyptic number.

25661035 is a deficient number, since it is larger than the sum of its proper divisors (5132213).

25661035 is an equidigital number, since it uses as much as digits as its factorization.

25661035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5132212.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 25661035 is about 5065.6722160045. The cubic root of 25661035 is about 294.9565578086.

Adding to 25661035 its reverse (53016652), we get a palindrome (78677687).

The spelling of 25661035 in words is "twenty-five million, six hundred sixty-one thousand, thirty-five".