691678952743 has 2 divisors, whose sum is σ = 691678952744. Its totient is φ = 691678952742.

The previous prime is 691678952729. The next prime is 691678952813. The reversal of 691678952743 is 347259876196.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691678952743 - 2³³ = 683089018151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691678952143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345839476371 + 345839476372.

It is an arithmetic number, because the mean of its divisors is an integer number (345839476372).

Almost surely, 2^691678952743 is an apocalyptic number.

691678952743 is a deficient number, since it is larger than the sum of its proper divisors (1).

691678952743 is an equidigital number, since it uses as much as digits as its factorization.

691678952743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137168640, while the sum is 67.

The spelling of 691678952743 in words is "six hundred ninety-one billion, six hundred seventy-eight million, nine hundred fifty-two thousand, seven hundred forty-three".