26355249649 has 3 divisors (see below), whose sum is σ = 26355411993. Its totient is φ = 26355087306.

The previous prime is 26355249623. The next prime is 26355249667. The reversal of 26355249649 is 94694255362.

The square root of 26355249649 is 162343.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 26355249649 - 2²³ = 26346861041 is a prime.

It is a super-2 number, since 2×26355249649² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26355249649.

It is not an unprimeable number, because it can be changed into a prime (26355249749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 81172 + ... + 243514.

It is an arithmetic number, because the mean of its divisors is an integer number (8785137331).

Almost surely, 2^26355249649 is an apocalyptic number.

26355249649 is the 162343-rd square number.

26355249649 is the 81172-nd centered octagonal number.

It is an amenable number.

26355249649 is a deficient number, since it is larger than the sum of its proper divisors (162344).

26355249649 is an frugal number, since it uses more digits than its factorization.

26355249649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324686 (or 162343 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 55.

The spelling of 26355249649 in words is "twenty-six billion, three hundred fifty-five million, two hundred forty-nine thousand, six hundred forty-nine".