225604156521 has 16 divisors (see below), whose sum is σ = 301723433984. Its totient is φ = 149944498704.

The previous prime is 225604156483. The next prime is 225604156553. The reversal of 225604156521 is 125651406522.

It is not a de Polignac number, because 225604156521 - 2⁶ = 225604156457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 225604156521.

It is not an unprimeable number, because it can be changed into a prime (225604154521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1267020 + ... + 1434066.

It is an arithmetic number, because the mean of its divisors is an integer number (18857714624).

Almost surely, 2^225604156521 is an apocalyptic number.

It is an amenable number.

225604156521 is a deficient number, since it is larger than the sum of its proper divisors (76119277463).

225604156521 is a wasteful number, since it uses less digits than its factorization.

225604156521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168420.

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 225604156521 in words is "two hundred twenty-five billion, six hundred four million, one hundred fifty-six thousand, five hundred twenty-one".