1691135537687 has 2 divisors, whose sum is σ = 1691135537688. Its totient is φ = 1691135537686.

The previous prime is 1691135537683. The next prime is 1691135537701. The reversal of 1691135537687 is 7867355311961.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1691135537687 - 2² = 1691135537683 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1691135537681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845567768843 + 845567768844.

It is an arithmetic number, because the mean of its divisors is an integer number (845567768844).

Almost surely, 2^{1691135537687} is an apocalyptic number.

1691135537687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691135537687 is an equidigital number, since it uses as much as digits as its factorization.

1691135537687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28576800, while the sum is 62.

The spelling of 1691135537687 in words is "one trillion, six hundred ninety-one billion, one hundred thirty-five million, five hundred thirty-seven thousand, six hundred eighty-seven".