166137325 has 6 divisors (see below), whose sum is σ = 206010314. Its totient is φ = 132909840.

The previous prime is 166137319. The next prime is 166137331. The reversal of 166137325 is 523731661.

It is an interprime number because it is at equal distance from previous prime (166137319) and next prime (166137331).

It can be written as a sum of positive squares in 3 ways, for example, as 18198756 + 147938569 = 4266^2 + 12163^2 .

It is not a de Polignac number, because 166137325 - 2⁹ = 166136813 is a prime.

It is a super-3 number, since 3×166137325³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3322722 + ... + 3322771.

Almost surely, 2^166137325 is an apocalyptic number.

It is an amenable number.

166137325 is a deficient number, since it is larger than the sum of its proper divisors (39872989).

166137325 is an equidigital number, since it uses as much as digits as its factorization.

166137325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6645503 (or 6645498 counting only the distinct ones).

The product of its digits is 22680, while the sum is 34.

The square root of 166137325 is about 12889.4268685617. The cubic root of 166137325 is about 549.7379743617.

Adding to 166137325 its reverse (523731661), we get a palindrome (689868986).

The spelling of 166137325 in words is "one hundred sixty-six million, one hundred thirty-seven thousand, three hundred twenty-five".