25535543641 has 2 divisors, whose sum is σ = 25535543642. Its totient is φ = 25535543640.

The previous prime is 25535543587. The next prime is 25535543647. The reversal of 25535543641 is 14634553552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18381936400 + 7153607241 = 135580^2 + 84579^2 .

It is a cyclic number.

It is not a de Polignac number, because 25535543641 - 2¹⁵ = 25535510873 is a prime.

It is not a weakly prime, because it can be changed into another prime (25535543647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12767771820 + 12767771821.

It is an arithmetic number, because the mean of its divisors is an integer number (12767771821).

Almost surely, 2^25535543641 is an apocalyptic number.

It is an amenable number.

25535543641 is a deficient number, since it is larger than the sum of its proper divisors (1).

25535543641 is an equidigital number, since it uses as much as digits as its factorization.

25535543641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080000, while the sum is 43.

The spelling of 25535543641 in words is "twenty-five billion, five hundred thirty-five million, five hundred forty-three thousand, six hundred forty-one".