664011011 has 4 divisors (see below), whose sum is σ = 664095672. Its totient is φ = 663926352.

The previous prime is 664011001. The next prime is 664011013. The reversal of 664011011 is 110110466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110110466 = 2 ⋅55055233.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664011011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664011013) 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, 29210 + ... + 46703.

It is an arithmetic number, because the mean of its divisors is an integer number (166023918).

Almost surely, 2^664011011 is an apocalyptic number.

664011011 is a deficient number, since it is larger than the sum of its proper divisors (84661).

664011011 is an equidigital number, since it uses as much as digits as its factorization.

664011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84660.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 664011011 is about 25768.4111074005. The cubic root of 664011011 is about 872.4189566298.

Adding to 664011011 its reverse (110110466), we get a palindrome (774121477).

The spelling of 664011011 in words is "six hundred sixty-four million, eleven thousand, eleven".