168220979 has 4 divisors (see below), whose sum is σ = 168300360. Its totient is φ = 168141600.

The previous prime is 168220963. The next prime is 168221021. The reversal of 168220979 is 979022861.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 168220979 - 2⁴ = 168220963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168270979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36422 + ... + 40779.

It is an arithmetic number, because the mean of its divisors is an integer number (42075090).

Almost surely, 2^168220979 is an apocalyptic number.

168220979 is a deficient number, since it is larger than the sum of its proper divisors (79381).

168220979 is an equidigital number, since it uses as much as digits as its factorization.

168220979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79380.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 168220979 is about 12970.0030454892. The cubic root of 168220979 is about 552.0266595592.

The spelling of 168220979 in words is "one hundred sixty-eight million, two hundred twenty thousand, nine hundred seventy-nine".