1686765497 has 2 divisors, whose sum is σ = 1686765498. Its totient is φ = 1686765496.

The previous prime is 1686765481. The next prime is 1686765499. The reversal of 1686765497 is 7945676861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1528106281 + 158659216 = 39091^2 + 12596^2 .

It is a cyclic number.

It is not a de Polignac number, because 1686765497 - 2⁴ = 1686765481 is a prime.

Together with 1686765499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1686765499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843382748 + 843382749.

It is an arithmetic number, because the mean of its divisors is an integer number (843382749).

Almost surely, 2^1686765497 is an apocalyptic number.

It is an amenable number.

1686765497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1686765497 is an equidigital number, since it uses as much as digits as its factorization.

1686765497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15240960, while the sum is 59.

The square root of 1686765497 is about 41070.2507540434. The cubic root of 1686765497 is about 1190.3780304517.

The spelling of 1686765497 in words is "one billion, six hundred eighty-six million, seven hundred sixty-five thousand, four hundred ninety-seven".