26649544321 has 4 divisors (see below), whose sum is σ = 26659714644. Its totient is φ = 26639374000.

The previous prime is 26649544303. The next prime is 26649544333. The reversal of 26649544321 is 12344594662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22941343296 + 3708201025 = 151464^2 + 60895^2 .

It is a cyclic number.

It is not a de Polignac number, because 26649544321 - 2¹⁹ = 26649020033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26649547321) 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 3 ways as a sum of consecutive naturals, for example, 5081230 + ... + 5086471.

It is an arithmetic number, because the mean of its divisors is an integer number (6664928661).

Almost surely, 2^26649544321 is an apocalyptic number.

It is an amenable number.

26649544321 is a deficient number, since it is larger than the sum of its proper divisors (10170323).

26649544321 is a wasteful number, since it uses less digits than its factorization.

26649544321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10170322.

The product of its digits is 1244160, while the sum is 46.

The spelling of 26649544321 in words is "twenty-six billion, six hundred forty-nine million, five hundred forty-four thousand, three hundred twenty-one".