1686064043 has 4 divisors (see below), whose sum is σ = 1686146208. Its totient is φ = 1685981880.

The previous prime is 1686064001. The next prime is 1686064087. The reversal of 1686064043 is 3404606861.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3404606861 = 6659 ⋅511279.

It is a cyclic number.

It is not a de Polignac number, because 1686064043 - 2¹⁰ = 1686063019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1686063988 and 1686064006.

It is not an unprimeable number, because it can be changed into a prime (1686064643) 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 in 3 ways as a sum of consecutive naturals, for example, 18605 + ... + 60977.

It is an arithmetic number, because the mean of its divisors is an integer number (421536552).

Almost surely, 2^1686064043 is an apocalyptic number.

1686064043 is a deficient number, since it is larger than the sum of its proper divisors (82165).

1686064043 is an equidigital number, since it uses as much as digits as its factorization.

1686064043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82164.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 1686064043 is about 41061.7101811408. The cubic root of 1686064043 is about 1190.2129983818.

The spelling of 1686064043 in words is "one billion, six hundred eighty-six million, sixty-four thousand, forty-three".