25865878050 has 36 divisors (see below), whose sum is σ = 69492993570. Its totient is φ = 6897567360.

The previous prime is 25865878043. The next prime is 25865878091. The reversal of 25865878050 is 5087856852.

It is a happy number.

25865878050 is a `hidden beast` number, since 2 + 5 + 8 + 6 + 587 + 8 + 0 + 50 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 11736038889 + 14129839161 = 108333^2 + 118869^2 .

It is an unprimeable number.

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 in 17 ways as a sum of consecutive naturals, for example, 28739415 + ... + 28740314.

Almost surely, 2^25865878050 is an apocalyptic number.

25865878050 is an abundant number, since it is smaller than the sum of its proper divisors (43627115520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25865878050 is a wasteful number, since it uses less digits than its factorization.

25865878050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57479747 (or 57479739 counting only the distinct ones).

The product of its (nonzero) digits is 5376000, while the sum is 54.

The spelling of 25865878050 in words is "twenty-five billion, eight hundred sixty-five million, eight hundred seventy-eight thousand, fifty".