168169025 has 6 divisors (see below), whose sum is σ = 208529622. Its totient is φ = 134535200.

The previous prime is 168169013. The next prime is 168169037. The reversal of 168169025 is 520961861.

It is a Cunningham number, because it is equal to 12968²+1.

It is an interprime number because it is at equal distance from previous prime (168169013) and next prime (168169037).

It can be written as a sum of positive squares in 3 ways, for example, as 1 + 168169024 = 1^2 + 12968^2 .

It is not a de Polignac number, because 168169025 - 2¹² = 168164929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 168169025.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3363356 + ... + 3363405.

It is an arithmetic number, because the mean of its divisors is an integer number (34754937).

Almost surely, 2^168169025 is an apocalyptic number.

It is an amenable number.

168169025 is a deficient number, since it is larger than the sum of its proper divisors (40360597).

168169025 is an equidigital number, since it uses as much as digits as its factorization.

168169025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6726771 (or 6726766 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 168169025 is about 12968.0000385564. Note that the first 4 decimals coincide. The cubic root of 168169025 is about 551.9698237109.

The spelling of 168169025 in words is "one hundred sixty-eight million, one hundred sixty-nine thousand, twenty-five".