20261324065361 has 4 divisors (see below), whose sum is σ = 20538876449892. Its totient is φ = 19983771680832.

The previous prime is 20261324065351. The next prime is 20261324065363. The reversal of 20261324065361 is 16356042316202.

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 11910125721025 + 8351198344336 = 3451105^2 + 2889844^2 .

It is a cyclic number.

It is not a de Polignac number, because 20261324065361 - 2²⁶ = 20261256956497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20261324065363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138776192156 + ... + 138776192301.

It is an arithmetic number, because the mean of its divisors is an integer number (5134719112473).

Almost surely, 2^{20261324065361} is an apocalyptic number.

It is an amenable number.

20261324065361 is a deficient number, since it is larger than the sum of its proper divisors (277552384531).

20261324065361 is an equidigital number, since it uses as much as digits as its factorization.

20261324065361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277552384530.

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 20261324065361 in words is "twenty trillion, two hundred sixty-one billion, three hundred twenty-four million, sixty-five thousand, three hundred sixty-one".