663965011 has 4 divisors (see below), whose sum is σ = 670539024. Its totient is φ = 657391000.

The previous prime is 663964999. The next prime is 663965047. The reversal of 663965011 is 110569366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110569366 = 2 ⋅55284683.

It is a cyclic number.

It is not a de Polignac number, because 663965011 - 2⁵ = 663964979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663966011) 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, 3286855 + ... + 3287056.

It is an arithmetic number, because the mean of its divisors is an integer number (167634756).

Almost surely, 2^663965011 is an apocalyptic number.

663965011 is a deficient number, since it is larger than the sum of its proper divisors (6574013).

663965011 is a wasteful number, since it uses less digits than its factorization.

663965011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6574012.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 663965011 is about 25767.5185262376. The cubic root of 663965011 is about 872.3988102778.

The spelling of 663965011 in words is "six hundred sixty-three million, nine hundred sixty-five thousand, eleven".