164040425 has 18 divisors (see below), whose sum is σ = 209099898. Its totient is φ = 127658880.

The previous prime is 164040421. The next prime is 164040449. The reversal of 164040425 is 524040461.

It can be written as a sum of positive squares in 9 ways, for example, as 2521744 + 161518681 = 1588^2 + 12709^2 .

It is not a de Polignac number, because 164040425 - 2² = 164040421 is a prime.

It is a super-2 number, since 2×164040425² = 53818522068361250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164040394 and 164040403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164040421) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 31829 + ... + 36621.

It is an arithmetic number, because the mean of its divisors is an integer number (11616661).

Almost surely, 2^164040425 is an apocalyptic number.

It is an amenable number.

164040425 is a deficient number, since it is larger than the sum of its proper divisors (45059473).

164040425 is an equidigital number, since it uses as much as digits as its factorization.

164040425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4877 (or 4835 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 164040425 is about 12807.8267086965. The cubic root of 164040425 is about 547.4153382710.

Adding to 164040425 its reverse (524040461), we get a palindrome (688080886).

The spelling of 164040425 in words is "one hundred sixty-four million, forty thousand, four hundred twenty-five".