168421825 has 24 divisors (see below), whose sum is σ = 245359296. Its totient is φ = 113064000.

The previous prime is 168421823. The next prime is 168421831. The reversal of 168421825 is 528124861.

It is not a de Polignac number, because 168421825 - 2¹ = 168421823 is a prime.

It is a super-2 number, since 2×168421825² = 56731822272661250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (168421823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19981 + ... + 27130.

It is an arithmetic number, because the mean of its divisors is an integer number (10223304).

Almost surely, 2^168421825 is an apocalyptic number.

It is an amenable number.

168421825 is a deficient number, since it is larger than the sum of its proper divisors (76937471).

168421825 is a wasteful number, since it uses less digits than its factorization.

168421825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47145 (or 47140 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 168421825 is about 12977.7434479188. The cubic root of 168421825 is about 552.2462680198.

The spelling of 168421825 in words is "one hundred sixty-eight million, four hundred twenty-one thousand, eight hundred twenty-five".