1685166685 has 8 divisors (see below), whose sum is σ = 2026084536. Its totient is φ = 1345543680.

The previous prime is 1685166671. The next prime is 1685166767. The reversal of 1685166685 is 5866615861.

It can be written as a sum of positive squares in 4 ways, for example, as 23299929 + 1661866756 = 4827^2 + 40766^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1685166685 - 2⁷ = 1685166557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320844 + ... + 326053.

It is an arithmetic number, because the mean of its divisors is an integer number (253260567).

Almost surely, 2^1685166685 is an apocalyptic number.

It is an amenable number.

1685166685 is a deficient number, since it is larger than the sum of its proper divisors (340917851).

1685166685 is an equidigital number, since it uses as much as digits as its factorization.

1685166685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647423.

The product of its digits is 2073600, while the sum is 52.

The square root of 1685166685 is about 41050.7817830550. The cubic root of 1685166685 is about 1190.0018089561.

The spelling of 1685166685 in words is "one billion, six hundred eighty-five million, one hundred sixty-six thousand, six hundred eighty-five".