211666147265 has 4 divisors (see below), whose sum is σ = 253999376724. Its totient is φ = 169332917808.

The previous prime is 211666147163. The next prime is 211666147267. The reversal of 211666147265 is 562741666112.

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 21206349376 + 190459797889 = 145624^2 + 436417^2 .

It is a cyclic number.

It is not a de Polignac number, because 211666147265 - 2²⁸ = 211397711809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211666147267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21166614722 + ... + 21166614731.

It is an arithmetic number, because the mean of its divisors is an integer number (63499844181).

Almost surely, 2^211666147265 is an apocalyptic number.

It is an amenable number.

211666147265 is a deficient number, since it is larger than the sum of its proper divisors (42333229459).

211666147265 is an equidigital number, since it uses as much as digits as its factorization.

211666147265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42333229458.

The product of its digits is 725760, while the sum is 47.

The spelling of 211666147265 in words is "two hundred eleven billion, six hundred sixty-six million, one hundred forty-seven thousand, two hundred sixty-five".