1686506677 has 2 divisors, whose sum is σ = 1686506678. Its totient is φ = 1686506676.

The previous prime is 1686506659. The next prime is 1686506683. The reversal of 1686506677 is 7766056861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 913611076 + 772895601 = 30226^2 + 27801^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1686506677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1686506077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843253338 + 843253339.

It is an arithmetic number, because the mean of its divisors is an integer number (843253339).

Almost surely, 2^1686506677 is an apocalyptic number.

It is an amenable number.

1686506677 is a deficient number, since it is larger than the sum of its proper divisors (1).

1686506677 is an equidigital number, since it uses as much as digits as its factorization.

1686506677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The square root of 1686506677 is about 41067.0996906283. The cubic root of 1686506677 is about 1190.3171428334.

The spelling of 1686506677 in words is "one billion, six hundred eighty-six million, five hundred six thousand, six hundred seventy-seven".