68517453889 has 16 divisors (see below), whose sum is σ = 70101669456. Its totient is φ = 66948940800.

The previous prime is 68517453883. The next prime is 68517453899. The reversal of 68517453889 is 98835471586.

It can be written as a sum of positive squares in 8 ways, for example, as 47625642289 + 20891811600 = 218233^2 + 144540^2 .

It is a cyclic number.

It is not a de Polignac number, because 68517453889 - 2¹⁹ = 68516929601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68517453889.

It is not an unprimeable number, because it can be changed into a prime (68517453883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12109149 + ... + 12114805.

It is an arithmetic number, because the mean of its divisors is an integer number (4381354341).

Almost surely, 2^68517453889 is an apocalyptic number.

It is an amenable number.

68517453889 is a deficient number, since it is larger than the sum of its proper divisors (1584215567).

68517453889 is a wasteful number, since it uses less digits than its factorization.

68517453889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6996.

The product of its digits is 58060800, while the sum is 64.

The spelling of 68517453889 in words is "sixty-eight billion, five hundred seventeen million, four hundred fifty-three thousand, eight hundred eighty-nine".