25535543647 has 2 divisors, whose sum is σ = 25535543648. Its totient is φ = 25535543646.

The previous prime is 25535543641. The next prime is 25535543659. The reversal of 25535543647 is 74634553552.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25535543647 - 2⁷ = 25535543519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25535543647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25535543641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12767771823 + 12767771824.

It is an arithmetic number, because the mean of its divisors is an integer number (12767771824).

Almost surely, 2^25535543647 is an apocalyptic number.

25535543647 is a deficient number, since it is larger than the sum of its proper divisors (1).

25535543647 is an equidigital number, since it uses as much as digits as its factorization.

25535543647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560000, while the sum is 49.

The spelling of 25535543647 in words is "twenty-five billion, five hundred thirty-five million, five hundred forty-three thousand, six hundred forty-seven".