665856235211 has 2 divisors, whose sum is σ = 665856235212. Its totient is φ = 665856235210.

The previous prime is 665856235201. The next prime is 665856235217. The reversal of 665856235211 is 112532658566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665856235211 - 2⁶ = 665856235147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665856235211.

It is not a weakly prime, because it can be changed into another prime (665856235217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332928117605 + 332928117606.

It is an arithmetic number, because the mean of its divisors is an integer number (332928117606).

Almost surely, 2^665856235211 is an apocalyptic number.

665856235211 is a deficient number, since it is larger than the sum of its proper divisors (1).

665856235211 is an equidigital number, since it uses as much as digits as its factorization.

665856235211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592000, while the sum is 50.

The spelling of 665856235211 in words is "six hundred sixty-five billion, eight hundred fifty-six million, two hundred thirty-five thousand, two hundred eleven".