168999621 has 8 divisors (see below), whose sum is σ = 257523264. Its totient is φ = 96571200.

The previous prime is 168999557. The next prime is 168999629. The reversal of 168999621 is 126999861.

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

It is not a de Polignac number, because 168999621 - 2⁶ = 168999557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168999629) 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 7 ways as a sum of consecutive naturals, for example, 4023780 + ... + 4023821.

It is an arithmetic number, because the mean of its divisors is an integer number (32190408).

Almost surely, 2^168999621 is an apocalyptic number.

It is an amenable number.

168999621 is a deficient number, since it is larger than the sum of its proper divisors (88523643).

168999621 is an equidigital number, since it uses as much as digits as its factorization.

168999621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8047611.

The product of its digits is 419904, while the sum is 51.

The square root of 168999621 is about 12999.9854230688. The cubic root of 168999621 is about 552.8770680726.

The spelling of 168999621 in words is "one hundred sixty-eight million, nine hundred ninety-nine thousand, six hundred twenty-one".