13155431515025 has 6 divisors (see below), whose sum is σ = 16312735078662. Its totient is φ = 10524345212000.

The previous prime is 13155431515021. The next prime is 13155431515117. The reversal of 13155431515025 is 52051513455131.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 13298471761 + 13142133043264 = 115319^2 + 3625208^2 .

It is not a de Polignac number, because 13155431515025 - 2² = 13155431515021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13155431515021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 263108630276 + ... + 263108630325.

It is an arithmetic number, because the mean of its divisors is an integer number (2718789179777).

Almost surely, 2^{13155431515025} is an apocalyptic number.

It is an amenable number.

13155431515025 is a deficient number, since it is larger than the sum of its proper divisors (3157303563637).

13155431515025 is an equidigital number, since it uses as much as digits as its factorization.

13155431515025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526217260611 (or 526217260606 counting only the distinct ones).

The product of its (nonzero) digits is 225000, while the sum is 41.

The spelling of 13155431515025 in words is "thirteen trillion, one hundred fifty-five billion, four hundred thirty-one million, five hundred fifteen thousand, twenty-five".