686811820033 has 2 divisors, whose sum is σ = 686811820034. Its totient is φ = 686811820032.

The previous prime is 686811820027. The next prime is 686811820039. The reversal of 686811820033 is 330028118686.

It is a balanced prime because it is at equal distance from previous prime (686811820027) and next prime (686811820039).

It can be written as a sum of positive squares in only one way, i.e., 618380922384 + 68430897649 = 786372^2 + 261593^2 .

It is a cyclic number.

It is not a de Polignac number, because 686811820033 - 2⁹ = 686811819521 is a prime.

It is a super-2 number, since 2×686811820033² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (686811820039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343405910016 + 343405910017.

It is an arithmetic number, because the mean of its divisors is an integer number (343405910017).

Almost surely, 2^686811820033 is an apocalyptic number.

It is an amenable number.

686811820033 is a deficient number, since it is larger than the sum of its proper divisors (1).

686811820033 is an equidigital number, since it uses as much as digits as its factorization.

686811820033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 686811820033 in words is "six hundred eighty-six billion, eight hundred eleven million, eight hundred twenty thousand, thirty-three".