166520325 has 12 divisors (see below), whose sum is σ = 275313728. Its totient is φ = 88810800.

The previous prime is 166520317. The next prime is 166520339. The reversal of 166520325 is 523025661.

166520325 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166520325 - 2³ = 166520317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166520292 and 166520301.

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, 1110061 + ... + 1110210.

Almost surely, 2^166520325 is an apocalyptic number.

166520325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166520325 is a deficient number, since it is larger than the sum of its proper divisors (108793403).

166520325 is a wasteful number, since it uses less digits than its factorization.

166520325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220284 (or 2220279 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 166520325 is about 12904.2754542826. The cubic root of 166520325 is about 550.1600911380.

Adding to 166520325 its reverse (523025661), we get a palindrome (689545986).

The spelling of 166520325 in words is "one hundred sixty-six million, five hundred twenty thousand, three hundred twenty-five".