66210125 has 8 divisors (see below), whose sum is σ = 82630392. Its totient is φ = 52968000.

The previous prime is 66210119. The next prime is 66210143. The reversal of 66210125 is 52101266.

It can be written as a sum of positive squares in 4 ways, for example, as 972196 + 65237929 = 986^2 + 8077^2 .

It is not a de Polignac number, because 66210125 - 2⁶ = 66210061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66210125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264716 + ... + 264965.

It is an arithmetic number, because the mean of its divisors is an integer number (10328799).

Almost surely, 2^66210125 is an apocalyptic number.

It is an amenable number.

66210125 is a deficient number, since it is larger than the sum of its proper divisors (16420267).

66210125 is an equidigital number, since it uses as much as digits as its factorization.

66210125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529696 (or 529686 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 66210125 is about 8136.9604275798. The cubic root of 66210125 is about 404.5524192257.

The spelling of 66210125 in words is "sixty-six million, two hundred ten thousand, one hundred twenty-five".