22408678217 has 2 divisors, whose sum is σ = 22408678218. Its totient is φ = 22408678216.

The previous prime is 22408678181. The next prime is 22408678219. The reversal of 22408678217 is 71287680422.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14938706176 + 7469972041 = 122224^2 + 86429^2 .

It is a cyclic number.

It is not a de Polignac number, because 22408678217 - 2¹² = 22408674121 is a prime.

Together with 22408678219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22408678219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11204339108 + 11204339109.

It is an arithmetic number, because the mean of its divisors is an integer number (11204339109).

Almost surely, 2^22408678217 is an apocalyptic number.

It is an amenable number.

22408678217 is a deficient number, since it is larger than the sum of its proper divisors (1).

22408678217 is an equidigital number, since it uses as much as digits as its factorization.

22408678217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 602112, while the sum is 47.

The spelling of 22408678217 in words is "twenty-two billion, four hundred eight million, six hundred seventy-eight thousand, two hundred seventeen".