68145641 has 2 divisors, whose sum is σ = 68145642. Its totient is φ = 68145640.

The previous prime is 68145617. The next prime is 68145643. The reversal of 68145641 is 14654186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57229225 + 10916416 = 7565^2 + 3304^2 .

It is a cyclic number.

It is not a de Polignac number, because 68145641 - 2⁶ = 68145577 is a prime.

Together with 68145643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68145643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34072820 + 34072821.

It is an arithmetic number, because the mean of its divisors is an integer number (34072821).

Almost surely, 2^68145641 is an apocalyptic number.

It is an amenable number.

68145641 is a deficient number, since it is larger than the sum of its proper divisors (1).

68145641 is an equidigital number, since it uses as much as digits as its factorization.

68145641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 35.

The square root of 68145641 is about 8255.0373106365. The cubic root of 68145641 is about 408.4567025627.

It can be divided in two parts, 68145 and 641, that added together give a palindrome (68786).

The spelling of 68145641 in words is "sixty-eight million, one hundred forty-five thousand, six hundred forty-one".