13220446025 has 6 divisors (see below), whose sum is σ = 16393353102. Its totient is φ = 10576356800.

The previous prime is 13220446013. The next prime is 13220446033. The reversal of 13220446025 is 52064402231.

It can be written as a sum of positive squares in 3 ways, for example, as 154355776 + 13066090249 = 12424^2 + 114307^2 .

It is not a de Polignac number, because 13220446025 - 2²⁰ = 13219397449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 264408896 + ... + 264408945.

It is an arithmetic number, because the mean of its divisors is an integer number (2732225517).

Almost surely, 2^13220446025 is an apocalyptic number.

It is an amenable number.

13220446025 is a deficient number, since it is larger than the sum of its proper divisors (3172907077).

13220446025 is an equidigital number, since it uses as much as digits as its factorization.

13220446025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528817851 (or 528817846 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 13220446025 its reverse (52064402231), we get a palindrome (65284848256).

The spelling of 13220446025 in words is "thirteen billion, two hundred twenty million, four hundred forty-six thousand, twenty-five".