26443638225 has 81 divisors (see below), whose sum is σ = 48844890003. Its totient is φ = 13675271040.

The previous prime is 26443638211. The next prime is 26443638253. The reversal of 26443638225 is 52283634462.

The square root of 26443638225 is 162615.

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

26443638225 is a `hidden beast` number, since 2 + 6 + 4 + 4 + 3 + 638 + 2 + 2 + 5 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 164634561 + 26279003664 = 12831^2 + 162108^2 .

It is not a de Polignac number, because 26443638225 - 2²⁷ = 26309420497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 90251179 + ... + 90251471.

Almost surely, 2^26443638225 is an apocalyptic number.

26443638225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

26443638225 is the 162615-th square number.

26443638225 is the 81308-th centered octagonal number.

It is an amenable number.

26443638225 is a deficient number, since it is larger than the sum of its proper divisors (22401251778).

26443638225 is an equidigital number, since it uses as much as digits as its factorization.

26443638225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676 (or 338 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 45.

The spelling of 26443638225 in words is "twenty-six billion, four hundred forty-three million, six hundred thirty-eight thousand, two hundred twenty-five".