68224448081 has 2 divisors, whose sum is σ = 68224448082. Its totient is φ = 68224448080.

The previous prime is 68224448077. The next prime is 68224448099. The reversal of 68224448081 is 18084442286.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36246067456 + 31978380625 = 190384^2 + 178825^2 .

It is a cyclic number.

It is not a de Polignac number, because 68224448081 - 2² = 68224448077 is a prime.

It is a super-2 number, since 2×68224448081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68224448011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34112224040 + 34112224041.

It is an arithmetic number, because the mean of its divisors is an integer number (34112224041).

Almost surely, 2^68224448081 is an apocalyptic number.

It is an amenable number.

68224448081 is a deficient number, since it is larger than the sum of its proper divisors (1).

68224448081 is an equidigital number, since it uses as much as digits as its factorization.

68224448081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 786432, while the sum is 47.

The spelling of 68224448081 in words is "sixty-eight billion, two hundred twenty-four million, four hundred forty-eight thousand, eighty-one".