663306961 has 4 divisors (see below), whose sum is σ = 663468400. Its totient is φ = 663145524.

The previous prime is 663306947. The next prime is 663306983. The reversal of 663306961 is 169603366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 663306961 - 2¹¹ = 663304913 is a prime.

It is a super-2 number, since 2×663306961² = 879952249022111042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663303961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74391 + ... + 82828.

It is an arithmetic number, because the mean of its divisors is an integer number (165867100).

Almost surely, 2^663306961 is an apocalyptic number.

It is an amenable number.

663306961 is a deficient number, since it is larger than the sum of its proper divisors (161439).

663306961 is a wasteful number, since it uses less digits than its factorization.

663306961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161438.

The product of its (nonzero) digits is 104976, while the sum is 40.

The square root of 663306961 is about 25754.7463780950. The cubic root of 663306961 is about 872.1105060308.

The spelling of 663306961 in words is "six hundred sixty-three million, three hundred six thousand, nine hundred sixty-one".