13263207556 has 27 divisors (see below), whose sum is σ = 23510674789. Its totient is φ = 6546956768.

The previous prime is 13263207539. The next prime is 13263207557. The reversal of 13263207556 is 65570236231.

The square root of 13263207556 is 115166.

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

It can be written as a sum of positive squares in only one way, i.e., 2546817156 + 10716390400 = 50466^2 + 103520^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13263207557) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20499225 + ... + 20499871.

Almost surely, 2^13263207556 is an apocalyptic number.

13263207556 is the 115166-th square number.

It is an amenable number.

13263207556 is a deficient number, since it is larger than the sum of its proper divisors (10247467233).

13263207556 is an frugal number, since it uses more digits than its factorization.

13263207556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476 (or 738 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 40.

The spelling of 13263207556 in words is "thirteen billion, two hundred sixty-three million, two hundred seven thousand, five hundred fifty-six".