665366450211211 has 16 divisors (see below), whose sum is σ = 784952544227328. Its totient is φ = 551913984626400.

The previous prime is 665366450211101. The next prime is 665366450211227. The reversal of 665366450211211 is 112112054663566.

It is a cyclic number.

It is not a de Polignac number, because 665366450211211 - 2²⁵ = 665366416656779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665366450211241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34077066 + ... + 49919728.

It is an arithmetic number, because the mean of its divisors is an integer number (49059534014208).

Almost surely, 2^{665366450211211} is an apocalyptic number.

665366450211211 is a deficient number, since it is larger than the sum of its proper divisors (119586094016117).

665366450211211 is a wasteful number, since it uses less digits than its factorization.

665366450211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16036242.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 665366450211211 in words is "six hundred sixty-five trillion, three hundred sixty-six billion, four hundred fifty million, two hundred eleven thousand, two hundred eleven".