25281577487 has 2 divisors, whose sum is σ = 25281577488. Its totient is φ = 25281577486.

The previous prime is 25281577427. The next prime is 25281577507. The reversal of 25281577487 is 78477518252.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25281577487 - 2¹² = 25281573391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25281577417) 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 as a sum of consecutive naturals, namely, 12640788743 + 12640788744.

It is an arithmetic number, because the mean of its divisors is an integer number (12640788744).

Almost surely, 2^25281577487 is an apocalyptic number.

25281577487 is a deficient number, since it is larger than the sum of its proper divisors (1).

25281577487 is an equidigital number, since it uses as much as digits as its factorization.

25281577487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8780800, while the sum is 56.

The spelling of 25281577487 in words is "twenty-five billion, two hundred eighty-one million, five hundred seventy-seven thousand, four hundred eighty-seven".