210125009065 has 4 divisors (see below), whose sum is σ = 252150010884. Its totient is φ = 168100007248.

The previous prime is 210125009051. The next prime is 210125009113. The reversal of 210125009065 is 560900521012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79384189504 + 130740819561 = 281752^2 + 361581^2 .

It is a cyclic number.

It is not a de Polignac number, because 210125009065 - 2²⁷ = 209990791337 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21012500902 + ... + 21012500911.

It is an arithmetic number, because the mean of its divisors is an integer number (63037502721).

Almost surely, 2^210125009065 is an apocalyptic number.

It is an amenable number.

210125009065 is a deficient number, since it is larger than the sum of its proper divisors (42025001819).

210125009065 is an equidigital number, since it uses as much as digits as its factorization.

210125009065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42025001818.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 210125009065 in words is "two hundred ten billion, one hundred twenty-five million, nine thousand, sixty-five".