166640525 has 12 divisors (see below), whose sum is σ = 213760500. Its totient is φ = 128714880.

The previous prime is 166640501. The next prime is 166640561. The reversal of 166640525 is 525046661.

It can be written as a sum of positive squares in 6 ways, for example, as 33884041 + 132756484 = 5821^2 + 11522^2 .

It is not a de Polignac number, because 166640525 - 2²⁰ = 165591949 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114200 + ... + 115649.

It is an arithmetic number, because the mean of its divisors is an integer number (17813375).

Almost surely, 2^166640525 is an apocalyptic number.

It is an amenable number.

166640525 is a deficient number, since it is larger than the sum of its proper divisors (47119975).

166640525 is a wasteful number, since it uses less digits than its factorization.

166640525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229888 (or 229883 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 166640525 is about 12908.9319852573. The cubic root of 166640525 is about 550.2924340175.

The spelling of 166640525 in words is "one hundred sixty-six million, six hundred forty thousand, five hundred twenty-five".