168420824445025 has 6 divisors (see below), whose sum is σ = 208841822311862. Its totient is φ = 134736659556000.

The previous prime is 168420824445007. The next prime is 168420824445091. The reversal of 168420824445025 is 520544428024861.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 8003173104144 + 160417651340881 = 2828988^2 + 12665609^2 .

It is not a de Polignac number, because 168420824445025 - 2⁹ = 168420824444513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3368416488876 + ... + 3368416488925.

Almost surely, 2^{168420824445025} is an apocalyptic number.

It is an amenable number.

168420824445025 is a deficient number, since it is larger than the sum of its proper divisors (40420997866837).

168420824445025 is an equidigital number, since it uses as much as digits as its factorization.

168420824445025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6736832977811 (or 6736832977806 counting only the distinct ones).

The product of its (nonzero) digits is 19660800, while the sum is 55.

The spelling of 168420824445025 in words is "one hundred sixty-eight trillion, four hundred twenty billion, eight hundred twenty-four million, four hundred forty-five thousand, twenty-five".