665056611101 has 2 divisors, whose sum is σ = 665056611102. Its totient is φ = 665056611100.

The previous prime is 665056611041. The next prime is 665056611103. The reversal of 665056611101 is 101116650566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 577957255225 + 87099355876 = 760235^2 + 295126^2 .

It is a cyclic number.

It is not a de Polignac number, because 665056611101 - 2²² = 665052416797 is a prime.

Together with 665056611103, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665056611103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332528305550 + 332528305551.

It is an arithmetic number, because the mean of its divisors is an integer number (332528305551).

Almost surely, 2^665056611101 is an apocalyptic number.

It is an amenable number.

665056611101 is a deficient number, since it is larger than the sum of its proper divisors (1).

665056611101 is an equidigital number, since it uses as much as digits as its factorization.

665056611101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 665056611101 in words is "six hundred sixty-five billion, fifty-six million, six hundred eleven thousand, one hundred one".