664002331 has 4 divisors (see below), whose sum is σ = 664243200. Its totient is φ = 663761464.

The previous prime is 664002319. The next prime is 664002349. The reversal of 664002331 is 133200466.

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 664002331 - 2¹¹ = 664000283 is a prime.

It is a super-2 number, since 2×664002331² = 881798191146867122, which contains 22 as substring.

It is a Duffinian number.

664002331 is a modest number, since divided by 2331 gives 664 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 664002296 and 664002305.

It is not an unprimeable number, because it can be changed into a prime (664002931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116251 + ... + 121828.

It is an arithmetic number, because the mean of its divisors is an integer number (166060800).

Almost surely, 2^664002331 is an apocalyptic number.

664002331 is a deficient number, since it is larger than the sum of its proper divisors (240869).

664002331 is a wasteful number, since it uses less digits than its factorization.

664002331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240868.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 664002331 is about 25768.2426835824. The cubic root of 664002331 is about 872.4151551720.

Adding to 664002331 its reverse (133200466), we get a palindrome (797202797).

The spelling of 664002331 in words is "six hundred sixty-four million, two thousand, three hundred thirty-one".