669571506 has 12 divisors (see below), whose sum is σ = 1450738302. Its totient is φ = 223190496.

The previous prime is 669571481. The next prime is 669571543. The reversal of 669571506 is 605175966.

It can be written as a sum of positive squares in only one way, i.e., 642166281 + 27405225 = 25341^2 + 5235^2 .

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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 5 ways as a sum of consecutive naturals, for example, 18599191 + ... + 18599226.

Almost surely, 2^669571506 is an apocalyptic number.

669571506 is an abundant number, since it is smaller than the sum of its proper divisors (781166796).

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

669571506 is a wasteful number, since it uses less digits than its factorization.

669571506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37198425 (or 37198422 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The square root of 669571506 is about 25876.0798035560. The cubic root of 669571506 is about 874.8474317938.

The spelling of 669571506 in words is "six hundred sixty-nine million, five hundred seventy-one thousand, five hundred six".