168415685 has 8 divisors (see below), whose sum is σ = 213987096. Its totient is φ = 126807040.

The previous prime is 168415669. The next prime is 168415691. The reversal of 168415685 is 586514861.

It can be written as a sum of positive squares in 4 ways, for example, as 46158436 + 122257249 = 6794^2 + 11057^2 .

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

It is not a de Polignac number, because 168415685 - 2⁴ = 168415669 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, 990596 + ... + 990765.

It is an arithmetic number, because the mean of its divisors is an integer number (26748387).

Almost surely, 2^168415685 is an apocalyptic number.

It is an amenable number.

168415685 is a deficient number, since it is larger than the sum of its proper divisors (45571411).

168415685 is a wasteful number, since it uses less digits than its factorization.

168415685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981383.

The product of its digits is 230400, while the sum is 44.

The square root of 168415685 is about 12977.5068869178. The cubic root of 168415685 is about 552.2395570263.

The spelling of 168415685 in words is "one hundred sixty-eight million, four hundred fifteen thousand, six hundred eighty-five".