66570025 has 12 divisors (see below), whose sum is σ = 82853452. Its totient is φ = 53058240.

The previous prime is 66570017. The next prime is 66570029. The reversal of 66570025 is 52007566.

It can be written as a sum of positive squares in 6 ways, for example, as 114921 + 66455104 = 339^2 + 8152^2 .

It is not a de Polignac number, because 66570025 - 2³ = 66570017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66570029) 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 11 ways as a sum of consecutive naturals, for example, 2119 + ... + 11731.

Almost surely, 2^66570025 is an apocalyptic number.

It is an amenable number.

66570025 is a deficient number, since it is larger than the sum of its proper divisors (16283427).

66570025 is a wasteful number, since it uses less digits than its factorization.

66570025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9900 (or 9895 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 66570025 is about 8159.0455936954. The cubic root of 66570025 is about 405.2841069069.

The spelling of 66570025 in words is "sixty-six million, five hundred seventy thousand, twenty-five".