164406625 has 8 divisors (see below), whose sum is σ = 205179624. Its totient is φ = 131525200.

The previous prime is 164406617. The next prime is 164406647. The reversal of 164406625 is 526604461.

It can be written as a sum of positive squares in 4 ways, for example, as 26132544 + 138274081 = 5112^2 + 11759^2 .

It is not a de Polignac number, because 164406625 - 2³ = 164406617 is a prime.

It is a super-3 number, since 3×164406625³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 657502 + ... + 657751.

It is an arithmetic number, because the mean of its divisors is an integer number (25647453).

Almost surely, 2^164406625 is an apocalyptic number.

It is an amenable number.

164406625 is a deficient number, since it is larger than the sum of its proper divisors (40772999).

164406625 is an equidigital number, since it uses as much as digits as its factorization.

164406625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315268 (or 1315258 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 164406625 is about 12822.1146851836. The cubic root of 164406625 is about 547.8223812537.

The spelling of 164406625 in words is "one hundred sixty-four million, four hundred six thousand, six hundred twenty-five".