168686849 has 4 divisors (see below), whose sum is σ = 168722736. Its totient is φ = 168650964.

The previous prime is 168686821. The next prime is 168686873. The reversal of 168686849 is 948686861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168686849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168686794 and 168686803.

It is not an unprimeable number, because it can be changed into a prime (168686879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9599 + ... + 20724.

It is an arithmetic number, because the mean of its divisors is an integer number (42180684).

Almost surely, 2^168686849 is an apocalyptic number.

It is an amenable number.

168686849 is a deficient number, since it is larger than the sum of its proper divisors (35887).

168686849 is an equidigital number, since it uses as much as digits as its factorization.

168686849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35886.

The product of its digits is 3981312, while the sum is 56.

The square root of 168686849 is about 12987.9501461932. The cubic root of 168686849 is about 552.5357827811.

The spelling of 168686849 in words is "one hundred sixty-eight million, six hundred eighty-six thousand, eight hundred forty-nine".