665126125 has 8 divisors (see below), whose sum is σ = 830077560. Its totient is φ = 532100800.

The previous prime is 665126123. The next prime is 665126129. The reversal of 665126125 is 521621566.

665126125 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 4 ways, for example, as 51523684 + 613602441 = 7178^2 + 24771^2 .

It is not a de Polignac number, because 665126125 - 2¹ = 665126123 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665126123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2660380 + ... + 2660629.

It is an arithmetic number, because the mean of its divisors is an integer number (103759695).

Almost surely, 2^665126125 is an apocalyptic number.

It is an amenable number.

665126125 is a deficient number, since it is larger than the sum of its proper divisors (164951435).

665126125 is an equidigital number, since it uses as much as digits as its factorization.

665126125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5321024 (or 5321014 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 665126125 is about 25790.0392593730. The cubic root of 665126125 is about 872.9070522070.

The spelling of 665126125 in words is "six hundred sixty-five million, one hundred twenty-six thousand, one hundred twenty-five".