164166725 has 12 divisors (see below), whose sum is σ = 203857860. Its totient is φ = 131145600.

The previous prime is 164166721. The next prime is 164166749. The reversal of 164166725 is 527661461.

164166725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 21077281 + 143089444 = 4591^2 + 11962^2 .

It is not a de Polignac number, because 164166725 - 2² = 164166721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164166721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14711 + ... + 23339.

It is an arithmetic number, because the mean of its divisors is an integer number (16988155).

Almost surely, 2^164166725 is an apocalyptic number.

It is an amenable number.

164166725 is a deficient number, since it is larger than the sum of its proper divisors (39691135).

164166725 is an equidigital number, since it uses as much as digits as its factorization.

164166725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9400 (or 9395 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The square root of 164166725 is about 12812.7563388991. The cubic root of 164166725 is about 547.5557931229. Note that the first 3 decimals are identical.

The spelling of 164166725 in words is "one hundred sixty-four million, one hundred sixty-six thousand, seven hundred twenty-five".