168400625 has 10 divisors (see below), whose sum is σ = 210434202. Its totient is φ = 134720000.

The previous prime is 168400621. The next prime is 168400637. The reversal of 168400625 is 526004861.

It can be written as a sum of positive squares in 5 ways, for example, as 66471409 + 101929216 = 8153^2 + 10096^2 .

It is not a de Polignac number, because 168400625 - 2² = 168400621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168400591 and 168400600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168400621) 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 9 ways as a sum of consecutive naturals, for example, 134096 + ... + 135345.

Almost surely, 2^168400625 is an apocalyptic number.

It is an amenable number.

168400625 is a deficient number, since it is larger than the sum of its proper divisors (42033577).

168400625 is an frugal number, since it uses more digits than its factorization.

168400625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269461 (or 269446 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 168400625 is about 12976.9266392316. The cubic root of 168400625 is about 552.2230958207.

The spelling of 168400625 in words is "one hundred sixty-eight million, four hundred thousand, six hundred twenty-five".