22236809681 has 2 divisors, whose sum is σ = 22236809682. Its totient is φ = 22236809680.

The previous prime is 22236809669. The next prime is 22236809719. The reversal of 22236809681 is 18690863222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20510822656 + 1725987025 = 143216^2 + 41545^2 .

It is a cyclic number.

It is not a de Polignac number, because 22236809681 - 2¹⁴ = 22236793297 is a prime.

It is a super-2 number, since 2×22236809681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22236899681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11118404840 + 11118404841.

It is an arithmetic number, because the mean of its divisors is an integer number (11118404841).

Almost surely, 2^22236809681 is an apocalyptic number.

It is an amenable number.

22236809681 is a deficient number, since it is larger than the sum of its proper divisors (1).

22236809681 is an equidigital number, since it uses as much as digits as its factorization.

22236809681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 47.

The spelling of 22236809681 in words is "twenty-two billion, two hundred thirty-six million, eight hundred nine thousand, six hundred eighty-one".