263367944818225 has 27 divisors (see below), whose sum is σ = 353631321940449. Its totient is φ = 194486318738400.

The previous prime is 263367944818127. The next prime is 263367944818229. The reversal of 263367944818225 is 522818449763362.

The square root of 263367944818225 is 16228615.

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

It can be written as a sum of positive squares in 4 ways, for example, as 67883477374449 + 195484467443776 = 8239143^2 + 13981576^2 .

It is not a de Polignac number, because 263367944818225 - 2¹⁵ = 263367944785457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263367944818229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1054735140 + ... + 1054984810.

Almost surely, 2^{263367944818225} is an apocalyptic number.

263367944818225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

263367944818225 is the 16228615-th square number.

263367944818225 is the 8114308-th centered octagonal number.

It is an amenable number.

263367944818225 is a deficient number, since it is larger than the sum of its proper divisors (90263377122224).

263367944818225 is an frugal number, since it uses more digits than its factorization.

263367944818225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499378 (or 249689 counting only the distinct ones).

The product of its digits is 836075520, while the sum is 70.

The spelling of 263367944818225 in words is "two hundred sixty-three trillion, three hundred sixty-seven billion, nine hundred forty-four million, eight hundred eighteen thousand, two hundred twenty-five".