168821806 has 8 divisors (see below), whose sum is σ = 253484280. Its totient is φ = 84327048.

The previous prime is 168821797. The next prime is 168821857. The reversal of 168821806 is 608128861.

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

It is a super-2 number, since 2×168821806² = 57001604362203272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39381 + ... + 43456.

It is an arithmetic number, because the mean of its divisors is an integer number (31685535).

Almost surely, 2^168821806 is an apocalyptic number.

168821806 is a deficient number, since it is larger than the sum of its proper divisors (84662474).

168821806 is a wasteful number, since it uses less digits than its factorization.

168821806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83858.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 168821806 is about 12993.1445770452. The cubic root of 168821806 is about 552.6830945896.

The spelling of 168821806 in words is "one hundred sixty-eight million, eight hundred twenty-one thousand, eight hundred six".