25578772871 has 2 divisors, whose sum is σ = 25578772872. Its totient is φ = 25578772870.

The previous prime is 25578772859. The next prime is 25578772873. The reversal of 25578772871 is 17827787552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25578772871 - 2¹⁰ = 25578771847 is a prime.

Together with 25578772873, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25578772871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25578772873) 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, 12789386435 + 12789386436.

It is an arithmetic number, because the mean of its divisors is an integer number (12789386436).

Almost surely, 2^25578772871 is an apocalyptic number.

25578772871 is a deficient number, since it is larger than the sum of its proper divisors (1).

25578772871 is an equidigital number, since it uses as much as digits as its factorization.

25578772871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15366400, while the sum is 59.

The spelling of 25578772871 in words is "twenty-five billion, five hundred seventy-eight million, seven hundred seventy-two thousand, eight hundred seventy-one".