681601233361 has 2 divisors, whose sum is σ = 681601233362. Its totient is φ = 681601233360.

The previous prime is 681601233331. The next prime is 681601233419. The reversal of 681601233361 is 163332106186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 460268621761 + 221332611600 = 678431^2 + 470460^2 .

It is a cyclic number.

It is not a de Polignac number, because 681601233361 - 2²⁹ = 681064362449 is a prime.

It is not a weakly prime, because it can be changed into another prime (681601233331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340800616680 + 340800616681.

It is an arithmetic number, because the mean of its divisors is an integer number (340800616681).

Almost surely, 2^681601233361 is an apocalyptic number.

It is an amenable number.

681601233361 is a deficient number, since it is larger than the sum of its proper divisors (1).

681601233361 is an equidigital number, since it uses as much as digits as its factorization.

681601233361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 681601233361 in words is "six hundred eighty-one billion, six hundred one million, two hundred thirty-three thousand, three hundred sixty-one".