68067656785 has 4 divisors (see below), whose sum is σ = 81681188148. Its totient is φ = 54454125424.

The previous prime is 68067656779. The next prime is 68067656803. The reversal of 68067656785 is 58765676086.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16727800896 + 51339855889 = 129336^2 + 226583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68067656785 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6806765674 + ... + 6806765683.

It is an arithmetic number, because the mean of its divisors is an integer number (20420297037).

Almost surely, 2^68067656785 is an apocalyptic number.

It is an amenable number.

68067656785 is a deficient number, since it is larger than the sum of its proper divisors (13613531363).

68067656785 is a wasteful number, since it uses less digits than its factorization.

68067656785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13613531362.

The product of its (nonzero) digits is 101606400, while the sum is 64.

The spelling of 68067656785 in words is "sixty-eight billion, sixty-seven million, six hundred fifty-six thousand, seven hundred eighty-five".