686430871811 has 2 divisors, whose sum is σ = 686430871812. Its totient is φ = 686430871810.

The previous prime is 686430871759. The next prime is 686430871823. The reversal of 686430871811 is 118178034686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686430871811 - 2²⁶ = 686363762947 is a prime.

It is not a weakly prime, because it can be changed into another prime (686430871871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343215435905 + 343215435906.

It is an arithmetic number, because the mean of its divisors is an integer number (343215435906).

Almost surely, 2^686430871811 is an apocalyptic number.

686430871811 is a deficient number, since it is larger than the sum of its proper divisors (1).

686430871811 is an equidigital number, since it uses as much as digits as its factorization.

686430871811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1548288, while the sum is 53.

The spelling of 686430871811 in words is "six hundred eighty-six billion, four hundred thirty million, eight hundred seventy-one thousand, eight hundred eleven".