25578772872 has 16 divisors (see below), whose sum is σ = 63946932240. Its totient is φ = 8526257616.

The previous prime is 25578772871. The next prime is 25578772873. The reversal of 25578772872 is 27827787552.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25578772871) and next prime (25578772873).

It is not an unprimeable number, because it can be changed into a prime (25578772871) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 532891078 + ... + 532891125.

It is an arithmetic number, because the mean of its divisors is an integer number (3996683265).

Almost surely, 2^25578772872 is an apocalyptic number.

It is an amenable number.

25578772872 is an abundant number, since it is smaller than the sum of its proper divisors (38368159368).

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

25578772872 is a wasteful number, since it uses less digits than its factorization.

25578772872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065782212 (or 1065782208 counting only the distinct ones).

The product of its digits is 30732800, while the sum is 60.

The spelling of 25578772872 in words is "twenty-five billion, five hundred seventy-eight million, seven hundred seventy-two thousand, eight hundred seventy-two".