691983964327 has 2 divisors, whose sum is σ = 691983964328. Its totient is φ = 691983964326.

The previous prime is 691983964313. The next prime is 691983964379. The reversal of 691983964327 is 723469389196.

691983964327 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691983964327 - 2¹⁵ = 691983931559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691983964307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345991982163 + 345991982164.

It is an arithmetic number, because the mean of its divisors is an integer number (345991982164).

Almost surely, 2^691983964327 is an apocalyptic number.

691983964327 is a deficient number, since it is larger than the sum of its proper divisors (1).

691983964327 is an equidigital number, since it uses as much as digits as its factorization.

691983964327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105815808, while the sum is 67.

The spelling of 691983964327 in words is "six hundred ninety-one billion, nine hundred eighty-three million, nine hundred sixty-four thousand, three hundred twenty-seven".