669690722 has 16 divisors (see below), whose sum is σ = 1030034232. Its totient is φ = 326426880.

The previous prime is 669690719. The next prime is 669690727. The reversal of 669690722 is 227096966.

It can be written as a sum of positive squares in 4 ways, for example, as 431019121 + 238671601 = 20761^2 + 15449^2 .

It is not an unprimeable number, because it can be changed into a prime (669690727) 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 7 ways as a sum of consecutive naturals, for example, 3479 + ... + 36762.

Almost surely, 2^669690722 is an apocalyptic number.

669690722 is a deficient number, since it is larger than the sum of its proper divisors (360343510).

669690722 is a wasteful number, since it uses less digits than its factorization.

669690722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40453.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 669690722 is about 25878.3832957161. The cubic root of 669690722 is about 874.8993503821.

The spelling of 669690722 in words is "six hundred sixty-nine million, six hundred ninety thousand, seven hundred twenty-two".