68888827661 has 2 divisors, whose sum is σ = 68888827662. Its totient is φ = 68888827660.

The previous prime is 68888827589. The next prime is 68888827663. The reversal of 68888827661 is 16672888886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58240651561 + 10648176100 = 241331^2 + 103190^2 .

It is a cyclic number.

It is not a de Polignac number, because 68888827661 - 2³⁰ = 67815085837 is a prime.

Together with 68888827663, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 68888827591 and 68888827600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68888827663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34444413830 + 34444413831.

It is an arithmetic number, because the mean of its divisors is an integer number (34444413831).

Almost surely, 2^68888827661 is an apocalyptic number.

It is an amenable number.

68888827661 is a deficient number, since it is larger than the sum of its proper divisors (1).

68888827661 is an equidigital number, since it uses as much as digits as its factorization.

68888827661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 99090432, while the sum is 68.

The spelling of 68888827661 in words is "sixty-eight billion, eight hundred eighty-eight million, eight hundred twenty-seven thousand, six hundred sixty-one".