660069442 has 4 divisors (see below), whose sum is σ = 990104166. Its totient is φ = 330034720.

The previous prime is 660069437. The next prime is 660069491. The reversal of 660069442 is 244960066.

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., 550887841 + 109181601 = 23471^2 + 10449^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165017359 + ... + 165017362.

Almost surely, 2^660069442 is an apocalyptic number.

660069442 is a deficient number, since it is larger than the sum of its proper divisors (330034724).

660069442 is a wasteful number, since it uses less digits than its factorization.

660069442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330034723.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 660069442 is about 25691.8166348742. The cubic root of 660069442 is about 870.6893035446.

The spelling of 660069442 in words is "six hundred sixty million, sixty-nine thousand, four hundred forty-two".