68818750081 has 2 divisors, whose sum is σ = 68818750082. Its totient is φ = 68818750080.

The previous prime is 68818750069. The next prime is 68818750097. The reversal of 68818750081 is 18005781886.

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., 68665485681 + 153264400 = 262041^2 + 12380^2 .

It is a cyclic number.

It is not a de Polignac number, because 68818750081 - 2²¹ = 68816652929 is a prime.

It is a super-2 number, since 2×68818750081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68818750051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34409375040 + 34409375041.

It is an arithmetic number, because the mean of its divisors is an integer number (34409375041).

Almost surely, 2^68818750081 is an apocalyptic number.

It is an amenable number.

68818750081 is a deficient number, since it is larger than the sum of its proper divisors (1).

68818750081 is an equidigital number, since it uses as much as digits as its factorization.

68818750081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 860160, while the sum is 52.

The spelling of 68818750081 in words is "sixty-eight billion, eight hundred eighteen million, seven hundred fifty thousand, eighty-one".