25510013220 has 24 divisors (see below), whose sum is σ = 71428037184. Its totient is φ = 6802670176.

The previous prime is 25510013209. The next prime is 25510013227. The reversal of 25510013220 is 2231001552.

It is not an unprimeable number, because it can be changed into a prime (25510013227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212583384 + ... + 212583503.

It is an arithmetic number, because the mean of its divisors is an integer number (2976168216).

Almost surely, 2^25510013220 is an apocalyptic number.

25510013220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25510013220 is an abundant number, since it is smaller than the sum of its proper divisors (45918023964).

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

25510013220 is a wasteful number, since it uses less digits than its factorization.

25510013220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425166899 (or 425166897 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

Adding to 25510013220 its reverse (2231001552), we get a palindrome (27741014772).

The spelling of 25510013220 in words is "twenty-five billion, five hundred ten million, thirteen thousand, two hundred twenty".