68064113881 has 9 divisors (see below), whose sum is σ = 68362569471. Its totient is φ = 67766959032.

The previous prime is 68064113857. The next prime is 68064113903. The reversal of 68064113881 is 18831146086.

The square root of 68064113881 is 260891.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3809975625 + 64254138256 = 61725^2 + 253484^2 .

It is a de Polignac number, because none of the positive numbers 2^k-68064113881 is a prime.

It is a super-2 number, since 2×68064113881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68064117881) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 82702036 + ... + 82702858.

Almost surely, 2^68064113881 is an apocalyptic number.

68064113881 is the 260891-st square number.

68064113881 is the 130446-th centered octagonal number.

It is an amenable number.

68064113881 is a deficient number, since it is larger than the sum of its proper divisors (298455590).

68064113881 is an frugal number, since it uses more digits than its factorization.

68064113881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 46.

The spelling of 68064113881 in words is "sixty-eight billion, sixty-four million, one hundred thirteen thousand, eight hundred eighty-one".