669165642 has 12 divisors (see below), whose sum is σ = 1449858930. Its totient is φ = 223055208.

The previous prime is 669165641. The next prime is 669165647. The reversal of 669165642 is 246561966.

It can be written as a sum of positive squares in only one way, i.e., 655923321 + 13242321 = 25611^2 + 3639^2 .

It is not an unprimeable number, because it can be changed into a prime (669165641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18587917 + ... + 18587952.

Almost surely, 2^669165642 is an apocalyptic number.

669165642 is an abundant number, since it is smaller than the sum of its proper divisors (780693288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669165642 is a wasteful number, since it uses less digits than its factorization.

669165642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37175877 (or 37175874 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 669165642 is about 25868.2361594292. The cubic root of 669165642 is about 874.6706317351.

The spelling of 669165642 in words is "six hundred sixty-nine million, one hundred sixty-five thousand, six hundred forty-two".