1685671877 has 2 divisors, whose sum is σ = 1685671878. Its totient is φ = 1685671876.

The previous prime is 1685671861. The next prime is 1685671879. The reversal of 1685671877 is 7781765861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1580937121 + 104734756 = 39761^2 + 10234^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685671877 - 2⁴ = 1685671861 is a prime.

Together with 1685671879, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685671879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842835938 + 842835939.

It is an arithmetic number, because the mean of its divisors is an integer number (842835939).

Almost surely, 2^1685671877 is an apocalyptic number.

It is an amenable number.

1685671877 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685671877 is an equidigital number, since it uses as much as digits as its factorization.

1685671877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3951360, while the sum is 56.

The square root of 1685671877 is about 41056.9345787042. The cubic root of 1685671877 is about 1190.1207129858.

The spelling of 1685671877 in words is "one billion, six hundred eighty-five million, six hundred seventy-one thousand, eight hundred seventy-seven".