686602867987 has 2 divisors, whose sum is σ = 686602867988. Its totient is φ = 686602867986.

The previous prime is 686602867967. The next prime is 686602867997. The reversal of 686602867987 is 789768206686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686602867987 - 2²³ = 686594479379 is a prime.

It is not a weakly prime, because it can be changed into another prime (686602867967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343301433993 + 343301433994.

It is an arithmetic number, because the mean of its divisors is an integer number (343301433994).

Almost surely, 2^686602867987 is an apocalyptic number.

686602867987 is a deficient number, since it is larger than the sum of its proper divisors (1).

686602867987 is an equidigital number, since it uses as much as digits as its factorization.

686602867987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 585252864, while the sum is 73.

The spelling of 686602867987 in words is "six hundred eighty-six billion, six hundred two million, eight hundred sixty-seven thousand, nine hundred eighty-seven".