681033433501 has 2 divisors, whose sum is σ = 681033433502. Its totient is φ = 681033433500.

The previous prime is 681033433477. The next prime is 681033433543. The reversal of 681033433501 is 105334330186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 619007032900 + 62026400601 = 786770^2 + 249051^2 .

It is a cyclic number.

It is not a de Polignac number, because 681033433501 - 2⁷ = 681033433373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681033437501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340516716750 + 340516716751.

It is an arithmetic number, because the mean of its divisors is an integer number (340516716751).

Almost surely, 2^681033433501 is an apocalyptic number.

It is an amenable number.

681033433501 is a deficient number, since it is larger than the sum of its proper divisors (1).

681033433501 is an equidigital number, since it uses as much as digits as its factorization.

681033433501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 37.

Adding to 681033433501 its reverse (105334330186), we get a palindrome (786367763687).

The spelling of 681033433501 in words is "six hundred eighty-one billion, thirty-three million, four hundred thirty-three thousand, five hundred one".