68653681 has 2 divisors, whose sum is σ = 68653682. Its totient is φ = 68653680.

The previous prime is 68653679. The next prime is 68653693. The reversal of 68653681 is 18635686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67914081 + 739600 = 8241^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 68653681 - 2¹ = 68653679 is a prime.

It is a super-3 number, since 3×68653681³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 68653679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (68653601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34326840 + 34326841.

It is an arithmetic number, because the mean of its divisors is an integer number (34326841).

Almost surely, 2^68653681 is an apocalyptic number.

It is an amenable number.

68653681 is a deficient number, since it is larger than the sum of its proper divisors (1).

68653681 is an equidigital number, since it uses as much as digits as its factorization.

68653681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 43.

The square root of 68653681 is about 8285.7516858762. The cubic root of 68653681 is about 409.4692338745.

The spelling of 68653681 in words is "sixty-eight million, six hundred fifty-three thousand, six hundred eighty-one".