164400025 has 6 divisors (see below), whose sum is σ = 203856062. Its totient is φ = 131520000.

The previous prime is 164400001. The next prime is 164400029. The reversal of 164400025 is 520004461.

164400025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 7974976 + 156425049 = 2824^2 + 12507^2 .

It is not a de Polignac number, because 164400025 - 2⁵ = 164399993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164399969 and 164400005.

It is not an unprimeable number, because it can be changed into a prime (164400029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3287976 + ... + 3288025.

Almost surely, 2^164400025 is an apocalyptic number.

It is an amenable number.

164400025 is a deficient number, since it is larger than the sum of its proper divisors (39456037).

164400025 is an equidigital number, since it uses as much as digits as its factorization.

164400025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6576011 (or 6576006 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 164400025 is about 12821.8573147575. The cubic root of 164400025 is about 547.8150504945.

Adding to 164400025 its reverse (520004461), we get a palindrome (684404486).

The spelling of 164400025 in words is "one hundred sixty-four million, four hundred thousand, twenty-five".