25506627571 has 2 divisors, whose sum is σ = 25506627572. Its totient is φ = 25506627570.

The previous prime is 25506627533. The next prime is 25506627631. The reversal of 25506627571 is 17572660552.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25506627571 is a prime.

It is not a weakly prime, because it can be changed into another prime (25506627521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12753313785 + 12753313786.

It is an arithmetic number, because the mean of its divisors is an integer number (12753313786).

Almost surely, 2^25506627571 is an apocalyptic number.

25506627571 is a deficient number, since it is larger than the sum of its proper divisors (1).

25506627571 is an equidigital number, since it uses as much as digits as its factorization.

25506627571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 882000, while the sum is 46.

The spelling of 25506627571 in words is "twenty-five billion, five hundred six million, six hundred twenty-seven thousand, five hundred seventy-one".