691013836691 has 2 divisors, whose sum is σ = 691013836692. Its totient is φ = 691013836690.

The previous prime is 691013836673. The next prime is 691013836729. The reversal of 691013836691 is 196638310196.

691013836691 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 691013836691 - 2³⁸ = 416135929747 is a prime.

It is not a weakly prime, because it can be changed into another prime (691013836391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345506918345 + 345506918346.

It is an arithmetic number, because the mean of its divisors is an integer number (345506918346).

Almost surely, 2^691013836691 is an apocalyptic number.

691013836691 is a deficient number, since it is larger than the sum of its proper divisors (1).

691013836691 is an equidigital number, since it uses as much as digits as its factorization.

691013836691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1259712, while the sum is 53.

The spelling of 691013836691 in words is "six hundred ninety-one billion, thirteen million, eight hundred thirty-six thousand, six hundred ninety-one".