68485704320881 has 9 divisors (see below), whose sum is σ = 68949666142273. Its totient is φ = 68024843931280.

The previous prime is 68485704320713. The next prime is 68485704320911. The reversal of 68485704320881 is 18802340758486.

The square root of 68485704320881 is 8275609.

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

It can be written as a sum of positive squares in 4 ways, for example, as 47671305522481 + 20814398798400 = 6904441^2 + 4562280^2 .

It is not a de Polignac number, because 68485704320881 - 2³⁷ = 68348265367409 is a prime.

It is a super-2 number, since 2×68485704320881² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68485704320081) 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, 1233037971 + ... + 1233093511.

Almost surely, 2^{68485704320881} is an apocalyptic number.

68485704320881 is the 8275609-th square number.

68485704320881 is the 4137805-th centered octagonal number.

It is an amenable number.

68485704320881 is a deficient number, since it is larger than the sum of its proper divisors (463961821392).

68485704320881 is an frugal number, since it uses more digits than its factorization.

68485704320881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111380 (or 55690 counting only the distinct ones).

The product of its (nonzero) digits is 82575360, while the sum is 64.

It can be divided in two parts, 6848 and 5704320881, that added together give a square (5704327729 = 75527²).

The spelling of 68485704320881 in words is "sixty-eight trillion, four hundred eighty-five billion, seven hundred four million, three hundred twenty thousand, eight hundred eighty-one".