211648725009 has 8 divisors (see below), whose sum is σ = 313553666720. Its totient is φ = 141099149988.

The previous prime is 211648724993. The next prime is 211648725011. The reversal of 211648725009 is 900527846112.

211648725009 is a `hidden beast` number, since 2 + 1 + 1 + 64 + 87 + 2 + 500 + 9 = 666.

It is not a de Polignac number, because 211648725009 - 2⁴ = 211648724993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (211648725059) 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, 3919420807 + ... + 3919420860.

It is an arithmetic number, because the mean of its divisors is an integer number (39194208340).

Almost surely, 2^211648725009 is an apocalyptic number.

It is an amenable number.

211648725009 is a deficient number, since it is larger than the sum of its proper divisors (101904941711).

211648725009 is an equidigital number, since it uses as much as digits as its factorization.

211648725009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7838841676 (or 7838841670 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 211648725009 in words is "two hundred eleven billion, six hundred forty-eight million, seven hundred twenty-five thousand, nine".