68306559381 has 6 divisors (see below), whose sum is σ = 98665030230. Its totient is φ = 45537706248.

The previous prime is 68306559341. The next prime is 68306559383. The reversal of 68306559381 is 18395560386.

68306559381 is a `hidden beast` number, since 6 + 8 + 3 + 0 + 6 + 559 + 3 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 59336575281 + 8969984100 = 243591^2 + 94710^2 .

It is not a de Polignac number, because 68306559381 - 2⁷ = 68306559253 is a prime.

It is a super-2 number, since 2×68306559381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68306559383) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3794808846 + ... + 3794808863.

It is an arithmetic number, because the mean of its divisors is an integer number (16444171705).

Almost surely, 2^68306559381 is an apocalyptic number.

It is an amenable number.

68306559381 is a deficient number, since it is larger than the sum of its proper divisors (30358470849).

68306559381 is a wasteful number, since it uses less digits than its factorization.

68306559381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7589617715 (or 7589617712 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 68306559381 in words is "sixty-eight billion, three hundred six million, five hundred fifty-nine thousand, three hundred eighty-one".