686523748943 has 2 divisors, whose sum is σ = 686523748944. Its totient is φ = 686523748942.

The previous prime is 686523748783. The next prime is 686523748957. The reversal of 686523748943 is 349847325686.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686523748943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686523748943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686523748243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343261874471 + 343261874472.

It is an arithmetic number, because the mean of its divisors is an integer number (343261874472).

Almost surely, 2^686523748943 is an apocalyptic number.

686523748943 is a deficient number, since it is larger than the sum of its proper divisors (1).

686523748943 is an equidigital number, since it uses as much as digits as its factorization.

686523748943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209018880, while the sum is 65.

The spelling of 686523748943 in words is "six hundred eighty-six billion, five hundred twenty-three million, seven hundred forty-eight thousand, nine hundred forty-three".