686811820027 has 2 divisors, whose sum is σ = 686811820028. Its totient is φ = 686811820026.

The previous prime is 686811819989. The next prime is 686811820033. The reversal of 686811820027 is 720028118686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686811820027 - 2³¹ = 684664336379 is a prime.

It is a super-2 number, since 2×686811820027² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (686811800027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343405910013 + 343405910014.

It is an arithmetic number, because the mean of its divisors is an integer number (343405910014).

Almost surely, 2^686811820027 is an apocalyptic number.

686811820027 is a deficient number, since it is larger than the sum of its proper divisors (1).

686811820027 is an equidigital number, since it uses as much as digits as its factorization.

686811820027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 516096, while the sum is 49.

The spelling of 686811820027 in words is "six hundred eighty-six billion, eight hundred eleven million, eight hundred twenty thousand, twenty-seven".