25643330220 has 48 divisors (see below), whose sum is σ = 71869176288. Its totient is φ = 6831759360.

The previous prime is 25643330203. The next prime is 25643330249. The reversal of 25643330220 is 2203334652.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 137749 + ... + 265068.

It is an arithmetic number, because the mean of its divisors is an integer number (1497274506).

Almost surely, 2^25643330220 is an apocalyptic number.

25643330220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25643330220 is an abundant number, since it is smaller than the sum of its proper divisors (46225846068).

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

25643330220 is a wasteful number, since it uses less digits than its factorization.

25643330220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403890 (or 403888 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 30.

Adding to 25643330220 its reverse (2203334652), we get a palindrome (27846664872).

The spelling of 25643330220 in words is "twenty-five billion, six hundred forty-three million, three hundred thirty thousand, two hundred twenty".