669849945 has 16 divisors (see below), whose sum is σ = 1077959232. Its totient is φ = 355186880.

The previous prime is 669849931. The next prime is 669849949. The reversal of 669849945 is 549948966.

It is not a de Polignac number, because 669849945 - 2¹⁷ = 669718873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (669849949) 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 in 15 ways as a sum of consecutive naturals, for example, 126471 + ... + 131660.

It is an arithmetic number, because the mean of its divisors is an integer number (67372452).

Almost surely, 2^669849945 is an apocalyptic number.

It is an amenable number.

669849945 is a deficient number, since it is larger than the sum of its proper divisors (408109287).

669849945 is a wasteful number, since it uses less digits than its factorization.

669849945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258312.

The product of its digits is 16796160, while the sum is 60.

The square root of 669849945 is about 25881.4594835763. The cubic root of 669849945 is about 874.9686824165.

The spelling of 669849945 in words is "six hundred sixty-nine million, eight hundred forty-nine thousand, nine hundred forty-five".