26699800824225 has 27 divisors (see below), whose sum is σ = 47822448746163. Its totient is φ = 14239852435440.

The previous prime is 26699800824119. The next prime is 26699800824251. The reversal of 26699800824225 is 52242800899662.

The square root of 26699800824225 is 5167185.

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., 9611928296721 + 17087872527504 = 3100311^2 + 4133748^2 .

It is not a de Polignac number, because 26699800824225 - 2⁹ = 26699800823713 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 77335536 + ... + 77680014.

Almost surely, 2^{26699800824225} is an apocalyptic number.

26699800824225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

26699800824225 is the 5167185-th square number.

26699800824225 is the 2583593-rd centered octagonal number.

It is an amenable number.

26699800824225 is a deficient number, since it is larger than the sum of its proper divisors (21122647921938).

26699800824225 is an frugal number, since it uses more digits than its factorization.

26699800824225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688974 (or 344487 counting only the distinct ones).

The product of its (nonzero) digits is 59719680, while the sum is 63.

The spelling of 26699800824225 in words is "twenty-six trillion, six hundred ninety-nine billion, eight hundred million, eight hundred twenty-four thousand, two hundred twenty-five".