26573890225 has 9 divisors (see below), whose sum is σ = 32952634603. Its totient is φ = 21258460120.

The previous prime is 26573890201. The next prime is 26573890237. The reversal of 26573890225 is 52209837562.

It is a happy number.

The square root of 26573890225 is 163015.

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., 9566600481 + 17007289744 = 97809^2 + 130412^2 .

It is not a de Polignac number, because 26573890225 - 2¹³ = 26573882033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 798774 + ... + 831376.

Almost surely, 2^26573890225 is an apocalyptic number.

26573890225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

26573890225 is the 163015-th square number.

26573890225 is the 81508-th centered octagonal number.

It is an amenable number.

26573890225 is a deficient number, since it is larger than the sum of its proper divisors (6378744378).

26573890225 is an frugal number, since it uses more digits than its factorization.

26573890225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65216 (or 32608 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 49.

Multiplying 26573890225 by its sum of digits (49), we get a square (1302120621025 = 1141105²).

The spelling of 26573890225 in words is "twenty-six billion, five hundred seventy-three million, eight hundred ninety thousand, two hundred twenty-five".