25353660641 has 8 divisors (see below), whose sum is σ = 25773071400. Its totient is φ = 24934371840.

The previous prime is 25353660637. The next prime is 25353660649. The reversal of 25353660641 is 14606635352.

It can be written as a sum of positive squares in 4 ways, for example, as 3445220416 + 21908440225 = 58696^2 + 148015^2 .

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 25353660641 - 2² = 25353660637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25353660649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451025 + ... + 504113.

It is an arithmetic number, because the mean of its divisors is an integer number (3221633925).

Almost surely, 2^25353660641 is an apocalyptic number.

It is an amenable number.

25353660641 is a deficient number, since it is larger than the sum of its proper divisors (419410759).

25353660641 is an equidigital number, since it uses as much as digits as its factorization.

25353660641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60979.

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 25353660641 in words is "twenty-five billion, three hundred fifty-three million, six hundred sixty thousand, six hundred forty-one".