664041442 has 8 divisors (see below), whose sum is σ = 1022982876. Its totient is φ = 323047152.

The previous prime is 664041419. The next prime is 664041461. The reversal of 664041442 is 244140466.

It can be written as a sum of positive squares in 2 ways, for example, as 664041361 + 81 = 25769^2 + 9^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 4486693 + ... + 4486840.

Almost surely, 2^664041442 is an apocalyptic number.

664041442 is a deficient number, since it is larger than the sum of its proper divisors (358941434).

664041442 is a wasteful number, since it uses less digits than its factorization.

664041442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8973572.

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 664041442 is about 25769.0015716558. The cubic root of 664041442 is about 872.4322838062.

The spelling of 664041442 in words is "six hundred sixty-four million, forty-one thousand, four hundred forty-two".