664348963 has 4 divisors (see below), whose sum is σ = 667687600. Its totient is φ = 661010328.

The previous prime is 664348961. The next prime is 664348969. The reversal of 664348963 is 369843466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664348963 - 2¹ = 664348961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664348961) 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, 1669020 + ... + 1669417.

It is an arithmetic number, because the mean of its divisors is an integer number (166921900).

Almost surely, 2^664348963 is an apocalyptic number.

664348963 is a deficient number, since it is larger than the sum of its proper divisors (3338637).

664348963 is a wasteful number, since it uses less digits than its factorization.

664348963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3338636.

The product of its digits is 2239488, while the sum is 49.

The square root of 664348963 is about 25774.9677594367. The cubic root of 664348963 is about 872.5669389780.

The spelling of 664348963 in words is "six hundred sixty-four million, three hundred forty-eight thousand, nine hundred sixty-three".