25621025220 has 96 divisors (see below), whose sum is σ = 91096992000. Its totient is φ = 5856233472.

The previous prime is 25621025219. The next prime is 25621025239. The reversal of 25621025220 is 2252012652.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3385245 + ... + 3392804.

It is an arithmetic number, because the mean of its divisors is an integer number (948927000).

Almost surely, 2^25621025220 is an apocalyptic number.

25621025220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25621025220 is an abundant number, since it is smaller than the sum of its proper divisors (65475966780).

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

25621025220 is a wasteful number, since it uses less digits than its factorization.

25621025220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6778074 (or 6778066 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 25621025220 its reverse (2252012652), we get a palindrome (27873037872).

The spelling of 25621025220 in words is "twenty-five billion, six hundred twenty-one million, twenty-five thousand, two hundred twenty".