691683585449 has 2 divisors, whose sum is σ = 691683585450. Its totient is φ = 691683585448.

The previous prime is 691683585419. The next prime is 691683585479. The reversal of 691683585449 is 944585386196.

691683585449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (691683585419) and next prime (691683585479).

It can be written as a sum of positive squares in only one way, i.e., 568580845849 + 123102739600 = 754043^2 + 350860^2 .

It is a cyclic number.

It is not a de Polignac number, because 691683585449 - 2¹⁶ = 691683519913 is a prime.

It is not a weakly prime, because it can be changed into another prime (691683585419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345841792724 + 345841792725.

It is an arithmetic number, because the mean of its divisors is an integer number (345841792725).

Almost surely, 2^691683585449 is an apocalyptic number.

It is an amenable number.

691683585449 is a deficient number, since it is larger than the sum of its proper divisors (1).

691683585449 is an equidigital number, since it uses as much as digits as its factorization.

691683585449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 223948800, while the sum is 68.

The spelling of 691683585449 in words is "six hundred ninety-one billion, six hundred eighty-three million, five hundred eighty-five thousand, four hundred forty-nine".