25546649563 has 2 divisors, whose sum is σ = 25546649564. Its totient is φ = 25546649562.

The previous prime is 25546649561. The next prime is 25546649573. The reversal of 25546649563 is 36594664552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25546649563 - 2¹ = 25546649561 is a prime.

Together with 25546649561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25546649561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12773324781 + 12773324782.

It is an arithmetic number, because the mean of its divisors is an integer number (12773324782).

Almost surely, 2^25546649563 is an apocalyptic number.

25546649563 is a deficient number, since it is larger than the sum of its proper divisors (1).

25546649563 is an equidigital number, since it uses as much as digits as its factorization.

25546649563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328000, while the sum is 55.

The spelling of 25546649563 in words is "twenty-five billion, five hundred forty-six million, six hundred forty-nine thousand, five hundred sixty-three".