25655178487 has 2 divisors, whose sum is σ = 25655178488. Its totient is φ = 25655178486.

The previous prime is 25655178481. The next prime is 25655178551. The reversal of 25655178487 is 78487155652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25655178487 - 2¹⁹ = 25654654199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25655178481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12827589243 + 12827589244.

It is an arithmetic number, because the mean of its divisors is an integer number (12827589244).

Almost surely, 2^25655178487 is an apocalyptic number.

25655178487 is a deficient number, since it is larger than the sum of its proper divisors (1).

25655178487 is an equidigital number, since it uses as much as digits as its factorization.

25655178487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816000, while the sum is 58.

The spelling of 25655178487 in words is "twenty-five billion, six hundred fifty-five million, one hundred seventy-eight thousand, four hundred eighty-seven".