1686317039851 has 2 divisors, whose sum is σ = 1686317039852. Its totient is φ = 1686317039850.

The previous prime is 1686317039843. The next prime is 1686317039861. The reversal of 1686317039851 is 1589307136861.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1686317039851 - 2³ = 1686317039843 is a prime.

It is not a weakly prime, because it can be changed into another prime (1686317039861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843158519925 + 843158519926.

It is an arithmetic number, because the mean of its divisors is an integer number (843158519926).

Almost surely, 2^{1686317039851} is an apocalyptic number.

1686317039851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1686317039851 is an equidigital number, since it uses as much as digits as its factorization.

1686317039851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6531840, while the sum is 58.

The spelling of 1686317039851 in words is "one trillion, six hundred eighty-six billion, three hundred seventeen million, thirty-nine thousand, eight hundred fifty-one".