26221316161 has 2 divisors, whose sum is σ = 26221316162. Its totient is φ = 26221316160.

The previous prime is 26221316141. The next prime is 26221316183. The reversal of 26221316161 is 16161312262.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24543922225 + 1677393936 = 156665^2 + 40956^2 .

It is a cyclic number.

It is not a de Polignac number, because 26221316161 - 2⁹ = 26221315649 is a prime.

It is not a weakly prime, because it can be changed into another prime (26221316131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13110658080 + 13110658081.

It is an arithmetic number, because the mean of its divisors is an integer number (13110658081).

Almost surely, 2^26221316161 is an apocalyptic number.

It is an amenable number.

26221316161 is a deficient number, since it is larger than the sum of its proper divisors (1).

26221316161 is an equidigital number, since it uses as much as digits as its factorization.

26221316161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The spelling of 26221316161 in words is "twenty-six billion, two hundred twenty-one million, three hundred sixteen thousand, one hundred sixty-one".