681033433477 has 2 divisors, whose sum is σ = 681033433478. Its totient is φ = 681033433476.

The previous prime is 681033433447. The next prime is 681033433501. The reversal of 681033433477 is 774334330186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 373264790116 + 307768643361 = 610954^2 + 554769^2 .

It is a cyclic number.

It is not a de Polignac number, because 681033433477 - 2¹⁹ = 681032909189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 681033433477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681033433447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340516716738 + 340516716739.

It is an arithmetic number, because the mean of its divisors is an integer number (340516716739).

Almost surely, 2^681033433477 is an apocalyptic number.

It is an amenable number.

681033433477 is a deficient number, since it is larger than the sum of its proper divisors (1).

681033433477 is an equidigital number, since it uses as much as digits as its factorization.

681033433477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3048192, while the sum is 49.

The spelling of 681033433477 in words is "six hundred eighty-one billion, thirty-three million, four hundred thirty-three thousand, four hundred seventy-seven".