25139128787 has 2 divisors, whose sum is σ = 25139128788. Its totient is φ = 25139128786.

The previous prime is 25139128717. The next prime is 25139128801. The reversal of 25139128787 is 78782193152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25139128787 - 2¹² = 25139124691 is a prime.

It is not a weakly prime, because it can be changed into another prime (25139128717) 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, 12569564393 + 12569564394.

It is an arithmetic number, because the mean of its divisors is an integer number (12569564394).

Almost surely, 2^25139128787 is an apocalyptic number.

25139128787 is a deficient number, since it is larger than the sum of its proper divisors (1).

25139128787 is an equidigital number, since it uses as much as digits as its factorization.

25139128787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 53.

The spelling of 25139128787 in words is "twenty-five billion, one hundred thirty-nine million, one hundred twenty-eight thousand, seven hundred eighty-seven".