664623346 has 4 divisors (see below), whose sum is σ = 996935022. Its totient is φ = 332311672.

The previous prime is 664623343. The next prime is 664623359. The reversal of 664623346 is 643326466.

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

It can be written as a sum of positive squares in only one way, i.e., 420045025 + 244578321 = 20495^2 + 15639^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664623299 and 664623308.

It is not an unprimeable number, because it can be changed into a prime (664623343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166155835 + ... + 166155838.

Almost surely, 2^664623346 is an apocalyptic number.

664623346 is a deficient number, since it is larger than the sum of its proper divisors (332311676).

664623346 is a wasteful number, since it uses less digits than its factorization.

664623346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332311675.

The product of its digits is 373248, while the sum is 40.

The square root of 664623346 is about 25780.2898742431. The cubic root of 664623346 is about 872.6870488373.

It can be divided in two parts, 6646 and 23346, that added together give a palindrome (29992).

The spelling of 664623346 in words is "six hundred sixty-four million, six hundred twenty-three thousand, three hundred forty-six".