13557109225 has 81 divisors (see below), whose sum is σ = 19402891599. Its totient is φ = 9389318400.

The previous prime is 13557109219. The next prime is 13557109229. The reversal of 13557109225 is 52290175531.

The square root of 13557109225 is 116435.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 7450624489 + 6106484736 = 86317^2 + 78144^2 .

It is not a de Polignac number, because 13557109225 - 2⁹ = 13557108713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13557109229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 185713789 + ... + 185713861.

Almost surely, 2^13557109225 is an apocalyptic number.

13557109225 is the 116435-th square number.

13557109225 is the 58218-th centered octagonal number.

It is an amenable number.

13557109225 is a deficient number, since it is larger than the sum of its proper divisors (5845782374).

13557109225 is an equidigital number, since it uses as much as digits as its factorization.

13557109225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 94500, while the sum is 40.

The spelling of 13557109225 in words is "thirteen billion, five hundred fifty-seven million, one hundred nine thousand, two hundred twenty-five".