68028121589 has 2 divisors, whose sum is σ = 68028121590. Its totient is φ = 68028121588.

The previous prime is 68028121583. The next prime is 68028121619. The reversal of 68028121589 is 98512182086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54060900100 + 13967221489 = 232510^2 + 118183^2 .

It is a cyclic number.

It is not a de Polignac number, because 68028121589 - 2¹⁶ = 68028056053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68028121583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34014060794 + 34014060795.

It is an arithmetic number, because the mean of its divisors is an integer number (34014060795).

Almost surely, 2^68028121589 is an apocalyptic number.

It is an amenable number.

68028121589 is a deficient number, since it is larger than the sum of its proper divisors (1).

68028121589 is an equidigital number, since it uses as much as digits as its factorization.

68028121589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 552960, while the sum is 50.

The spelling of 68028121589 in words is "sixty-eight billion, twenty-eight million, one hundred twenty-one thousand, five hundred eighty-nine".