691636340683 has 2 divisors, whose sum is σ = 691636340684. Its totient is φ = 691636340682.

The previous prime is 691636340677. The next prime is 691636340777. The reversal of 691636340683 is 386043636196.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691636340683 - 2⁵ = 691636340651 is a prime.

It is not a weakly prime, because it can be changed into another prime (691636340663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345818170341 + 345818170342.

It is an arithmetic number, because the mean of its divisors is an integer number (345818170342).

Almost surely, 2^691636340683 is an apocalyptic number.

691636340683 is a deficient number, since it is larger than the sum of its proper divisors (1).

691636340683 is an equidigital number, since it uses as much as digits as its factorization.

691636340683 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10077696, while the sum is 55.

The spelling of 691636340683 in words is "six hundred ninety-one billion, six hundred thirty-six million, three hundred forty thousand, six hundred eighty-three".