225135405521 has 8 divisors (see below), whose sum is σ = 244854044904. Its totient is φ = 205759699200.

The previous prime is 225135405497. The next prime is 225135405553. The reversal of 225135405521 is 125504531522.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20202642496 + 204932763025 = 142136^2 + 452695^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 225135405521 - 2⁶ = 225135405457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225135405571) 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, 85731896 + ... + 85734521.

It is an arithmetic number, because the mean of its divisors is an integer number (30606755613).

Almost surely, 2^225135405521 is an apocalyptic number.

It is an amenable number.

225135405521 is a deficient number, since it is larger than the sum of its proper divisors (19718639383).

225135405521 is a wasteful number, since it uses less digits than its factorization.

225135405521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171466531.

The product of its (nonzero) digits is 60000, while the sum is 35.

The spelling of 225135405521 in words is "two hundred twenty-five billion, one hundred thirty-five million, four hundred five thousand, five hundred twenty-one".