25244245707661 has 4 divisors (see below), whose sum is σ = 25324898250172. Its totient is φ = 25163593165152.

The previous prime is 25244245707649. The next prime is 25244245707721. The reversal of 25244245707661 is 16670754244252.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11061444515625 + 14182801192036 = 3325875^2 + 3766006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25244245707661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25244245704661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40326270786 + ... + 40326271411.

It is an arithmetic number, because the mean of its divisors is an integer number (6331224562543).

Almost surely, 2^{25244245707661} is an apocalyptic number.

It is an amenable number.

25244245707661 is a deficient number, since it is larger than the sum of its proper divisors (80652542511).

25244245707661 is an equidigital number, since it uses as much as digits as its factorization.

25244245707661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80652542510.

The product of its (nonzero) digits is 22579200, while the sum is 55.

The spelling of 25244245707661 in words is "twenty-five trillion, two hundred forty-four billion, two hundred forty-five million, seven hundred seven thousand, six hundred sixty-one".