664189298 has 4 divisors (see below), whose sum is σ = 996283950. Its totient is φ = 332094648.

The previous prime is 664189297. The next prime is 664189301. The reversal of 664189298 is 892981466.

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., 601573729 + 62615569 = 24527^2 + 7913^2 .

It is a super-2 number, since 2×664189298² = 882294847155465608, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664189297) 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, 166047323 + ... + 166047326.

Almost surely, 2^664189298 is an apocalyptic number.

664189298 is a deficient number, since it is larger than the sum of its proper divisors (332094652).

664189298 is a wasteful number, since it uses less digits than its factorization.

664189298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332094651.

The product of its digits is 1492992, while the sum is 53.

The square root of 664189298 is about 25771.8702852548. The cubic root of 664189298 is about 872.4970311582.

The spelling of 664189298 in words is "six hundred sixty-four million, one hundred eighty-nine thousand, two hundred ninety-eight".