1691943342511 has 2 divisors, whose sum is σ = 1691943342512. Its totient is φ = 1691943342510.

The previous prime is 1691943342493. The next prime is 1691943342553. The reversal of 1691943342511 is 1152433491961.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1691943342511 - 2³⁹ = 1142187528623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1691943345511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845971671255 + 845971671256.

It is an arithmetic number, because the mean of its divisors is an integer number (845971671256).

Almost surely, 2^{1691943342511} is an apocalyptic number.

1691943342511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691943342511 is an equidigital number, since it uses as much as digits as its factorization.

1691943342511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 49.

The spelling of 1691943342511 in words is "one trillion, six hundred ninety-one billion, nine hundred forty-three million, three hundred forty-two thousand, five hundred eleven".