68140980865 has 8 divisors (see below), whose sum is σ = 81773464680. Its totient is φ = 54509926272.

The previous prime is 68140980823. The next prime is 68140980899. The reversal of 68140980865 is 56808904186.

It can be written as a sum of positive squares in 4 ways, for example, as 26944565904 + 41196414961 = 164148^2 + 202969^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68140980865 - 2¹¹ = 68140978817 is a prime.

It is a super-2 number, since 2×68140980865² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249454 + ... + 445543.

It is an arithmetic number, because the mean of its divisors is an integer number (10221683085).

Almost surely, 2^68140980865 is an apocalyptic number.

It is an amenable number.

68140980865 is a deficient number, since it is larger than the sum of its proper divisors (13632483815).

68140980865 is a wasteful number, since it uses less digits than its factorization.

68140980865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714611.

The product of its (nonzero) digits is 3317760, while the sum is 55.

The spelling of 68140980865 in words is "sixty-eight billion, one hundred forty million, nine hundred eighty thousand, eight hundred sixty-five".