225638809992 has 324 divisors, whose sum is σ = 674766970605. Its totient is φ = 68101558272.

The previous prime is 225638809973. The next prime is 225638810063. The reversal of 225638809992 is 299908836522.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 14 ways, for example, as 37305377316 + 188333432676 = 193146^2 + 433974^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=335886.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 2535267484 + ... + 2535267572.

Almost surely, 2^225638809992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 225638809992

225638809992 is an abundant number, since it is smaller than the sum of its proper divisors (449128160613).

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

225638809992 is a wasteful number, since it uses less digits than its factorization.

225638809992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 63.

The spelling of 225638809992 in words is "two hundred twenty-five billion, six hundred thirty-eight million, eight hundred nine thousand, nine hundred ninety-two".