166265725 has 6 divisors (see below), whose sum is σ = 206169530. Its totient is φ = 133012560.

The previous prime is 166265719. The next prime is 166265731. The reversal of 166265725 is 527562661.

It is an interprime number because it is at equal distance from previous prime (166265719) and next prime (166265731).

It can be written as a sum of positive squares in 3 ways, for example, as 25060036 + 141205689 = 5006^2 + 11883^2 .

It is not a de Polignac number, because 166265725 - 2¹¹ = 166263677 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3325290 + ... + 3325339.

Almost surely, 2^166265725 is an apocalyptic number.

It is an amenable number.

166265725 is a deficient number, since it is larger than the sum of its proper divisors (39903805).

166265725 is an equidigital number, since it uses as much as digits as its factorization.

166265725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6650639 (or 6650634 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 166265725 is about 12894.4067331537. The cubic root of 166265725 is about 549.8795604048.

The spelling of 166265725 in words is "one hundred sixty-six million, two hundred sixty-five thousand, seven hundred twenty-five".