25243535646661 has 4 divisors (see below), whose sum is σ = 25830594615232. Its totient is φ = 24656476678092.

The previous prime is 25243535646647. The next prime is 25243535646689. The reversal of 25243535646661 is 16664653534252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25243535646661 - 2¹⁹ = 25243535122373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25243535646596 and 25243535646605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25243535644661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293529484221 + ... + 293529484306.

It is an arithmetic number, because the mean of its divisors is an integer number (6457648653808).

Almost surely, 2^{25243535646661} is an apocalyptic number.

It is an amenable number.

25243535646661 is a deficient number, since it is larger than the sum of its proper divisors (587058968571).

25243535646661 is an equidigital number, since it uses as much as digits as its factorization.

25243535646661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587058968570.

The product of its digits is 93312000, while the sum is 58.

The spelling of 25243535646661 in words is "twenty-five trillion, two hundred forty-three billion, five hundred thirty-five million, six hundred forty-six thousand, six hundred sixty-one".