225535721161540 has 12 divisors (see below), whose sum is σ = 473625014439276. Its totient is φ = 90214288464608.

The previous prime is 225535721161537. The next prime is 225535721161547. The reversal of 225535721161540 is 45161127535522.

It can be written as a sum of positive squares in 2 ways, for example, as 29088137928964 + 196447583232576 = 5393342^2 + 14015976^2 .

It is not an unprimeable number, because it can be changed into a prime (225535721161547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5638393029019 + ... + 5638393029058.

It is an arithmetic number, because the mean of its divisors is an integer number (39468751203273).

Almost surely, 2^{225535721161540} is an apocalyptic number.

225535721161540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225535721161540 is an abundant number, since it is smaller than the sum of its proper divisors (248089293277736).

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

225535721161540 is a wasteful number, since it uses less digits than its factorization.

225535721161540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11276786058086 (or 11276786058084 counting only the distinct ones).

The product of its (nonzero) digits is 2520000, while the sum is 49.

The spelling of 225535721161540 in words is "two hundred twenty-five trillion, five hundred thirty-five billion, seven hundred twenty-one million, one hundred sixty-one thousand, five hundred forty".