25579642820 has 24 divisors (see below), whose sum is σ = 53732880600. Its totient is φ = 10228879872.

The previous prime is 25579642801. The next prime is 25579642831. The reversal of 25579642820 is 2824697552.

It can be written as a sum of positive squares in 4 ways, for example, as 835094404 + 24744548416 = 28898^2 + 157304^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114965 + ... + 253724.

It is an arithmetic number, because the mean of its divisors is an integer number (2238870025).

Almost surely, 2^25579642820 is an apocalyptic number.

25579642820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25579642820 is an abundant number, since it is smaller than the sum of its proper divisors (28153237780).

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

25579642820 is a wasteful number, since it uses less digits than its factorization.

25579642820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372167 (or 372165 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 25579642820 in words is "twenty-five billion, five hundred seventy-nine million, six hundred forty-two thousand, eight hundred twenty".