668536911 has 12 divisors (see below), whose sum is σ = 1103616592. Its totient is φ = 382021056.

The previous prime is 668536909. The next prime is 668536931. The reversal of 668536911 is 119635866.

668536911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668536911 - 2¹ = 668536909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668536931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5305786 + ... + 5305911.

Almost surely, 2^668536911 is an apocalyptic number.

668536911 is a deficient number, since it is larger than the sum of its proper divisors (435079681).

668536911 is a wasteful number, since it uses less digits than its factorization.

668536911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611710 (or 10611707 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 668536911 is about 25856.0807354866. The cubic root of 668536911 is about 874.3966064761.

The spelling of 668536911 in words is "six hundred sixty-eight million, five hundred thirty-six thousand, nine hundred eleven".