25642055987 has 2 divisors, whose sum is σ = 25642055988. Its totient is φ = 25642055986.

The previous prime is 25642055917. The next prime is 25642056053. The reversal of 25642055987 is 78955024652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25642055987 is a prime.

It is not a weakly prime, because it can be changed into another prime (25642055917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12821027993 + 12821027994.

It is an arithmetic number, because the mean of its divisors is an integer number (12821027994).

Almost surely, 2^25642055987 is an apocalyptic number.

25642055987 is a deficient number, since it is larger than the sum of its proper divisors (1).

25642055987 is an equidigital number, since it uses as much as digits as its factorization.

25642055987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048000, while the sum is 53.

The spelling of 25642055987 in words is "twenty-five billion, six hundred forty-two million, fifty-five thousand, nine hundred eighty-seven".