166520525 has 24 divisors (see below), whose sum is σ = 219360960. Its totient is φ = 124962560.

The previous prime is 166520521. The next prime is 166520531. The reversal of 166520525 is 525025661.

It is not a de Polignac number, because 166520525 - 2² = 166520521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166520491 and 166520500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166520521) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 198056 + ... + 198894.

It is an arithmetic number, because the mean of its divisors is an integer number (9140040).

Almost surely, 2^166520525 is an apocalyptic number.

It is an amenable number.

166520525 is a deficient number, since it is larger than the sum of its proper divisors (52840435).

166520525 is a wasteful number, since it uses less digits than its factorization.

166520525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333 (or 1328 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 166520525 is about 12904.2832036499. The cubic root of 166520525 is about 550.1603113954.

The spelling of 166520525 in words is "one hundred sixty-six million, five hundred twenty thousand, five hundred twenty-five".