225220261240 has 96 divisors (see below), whose sum is σ = 575960626080. Its totient is φ = 78781434624.

The previous prime is 225220261181. The next prime is 225220261309. The reversal of 225220261240 is 42162022522.

It is a junction number, because it is equal to n+sod(n) for n = 225220261199 and 225220261208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 412164 + ... + 787603.

It is an arithmetic number, because the mean of its divisors is an integer number (5999589855).

Almost surely, 2^225220261240 is an apocalyptic number.

225220261240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225220261240 is an abundant number, since it is smaller than the sum of its proper divisors (350740364840).

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

225220261240 is a wasteful number, since it uses less digits than its factorization.

225220261240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199829 (or 1199806 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 225220261240 its reverse (42162022522), we get a palindrome (267382283762).

The spelling of 225220261240 in words is "two hundred twenty-five billion, two hundred twenty million, two hundred sixty-one thousand, two hundred forty".