691683585419 has 2 divisors, whose sum is σ = 691683585420. Its totient is φ = 691683585418.

The previous prime is 691683585371. The next prime is 691683585449. The reversal of 691683585419 is 914585386196.

691683585419 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 691683585419 - 2²⁰ = 691682536843 is a prime.

It is a super-2 number, since 2×691683585419² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (691683585449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345841792709 + 345841792710.

It is an arithmetic number, because the mean of its divisors is an integer number (345841792710).

Almost surely, 2^691683585419 is an apocalyptic number.

691683585419 is a deficient number, since it is larger than the sum of its proper divisors (1).

691683585419 is an equidigital number, since it uses as much as digits as its factorization.

691683585419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55987200, while the sum is 65.

The spelling of 691683585419 in words is "six hundred ninety-one billion, six hundred eighty-three million, five hundred eighty-five thousand, four hundred nineteen".