26818646401 has 4 divisors (see below), whose sum is σ = 27258296404. Its totient is φ = 26378996400.

The previous prime is 26818646389. The next prime is 26818646443. The reversal of 26818646401 is 10464681862.

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 8463816001 + 18354830400 = 91999^2 + 135480^2 .

It is a cyclic number.

It is not a de Polignac number, because 26818646401 - 2¹⁹ = 26818122113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26818646201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219824910 + ... + 219825031.

It is an arithmetic number, because the mean of its divisors is an integer number (6814574101).

Almost surely, 2^26818646401 is an apocalyptic number.

It is an amenable number.

26818646401 is a deficient number, since it is larger than the sum of its proper divisors (439650003).

26818646401 is an equidigital number, since it uses as much as digits as its factorization.

26818646401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439650002.

The product of its (nonzero) digits is 442368, while the sum is 46.

The spelling of 26818646401 in words is "twenty-six billion, eight hundred eighteen million, six hundred forty-six thousand, four hundred one".