664998242 has 4 divisors (see below), whose sum is σ = 997497366. Its totient is φ = 332499120.

The previous prime is 664998239. The next prime is 664998247. The reversal of 664998242 is 242899466.

It is a happy number.

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., 590538601 + 74459641 = 24301^2 + 8629^2 .

It is not an unprimeable number, because it can be changed into a prime (664998247) 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 as a sum of consecutive naturals, namely, 166249559 + ... + 166249562.

Almost surely, 2^664998242 is an apocalyptic number.

664998242 is a deficient number, since it is larger than the sum of its proper divisors (332499124).

664998242 is a wasteful number, since it uses less digits than its factorization.

664998242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332499123.

The product of its digits is 1492992, while the sum is 50.

The square root of 664998242 is about 25787.5598302748. The cubic root of 664998242 is about 872.8511043582.

The spelling of 664998242 in words is "six hundred sixty-four million, nine hundred ninety-eight thousand, two hundred forty-two".