168009975 has 90 divisors (see below), whose sum is σ = 352186536. Its totient is φ = 76557600.

The previous prime is 168009971. The next prime is 168009979. The reversal of 168009975 is 579900861.

It is an interprime number because it is at equal distance from previous prime (168009971) and next prime (168009979).

It is not a de Polignac number, because 168009975 - 2² = 168009971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 168009975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168009971) 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 89 ways as a sum of consecutive naturals, for example, 540070 + ... + 540380.

Almost surely, 2^168009975 is an apocalyptic number.

168009975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

168009975 is an abundant number, since it is smaller than the sum of its proper divisors (184176561).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

168009975 is an equidigital number, since it uses as much as digits as its factorization.

168009975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 168009975 is about 12961.8661850831. The cubic root of 168009975 is about 551.7957558016.

The spelling of 168009975 in words is "one hundred sixty-eight million, nine thousand, nine hundred seventy-five".