669633608 has 36 divisors (see below), whose sum is σ = 1461671235. Its totient is φ = 286766256.

The previous prime is 669633541. The next prime is 669633611. The reversal of 669633608 is 806336966.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

669633608 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 334816804 + 334816804 = 18298^2 + 18298^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=18298.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 511691 + ... + 512997.

Almost surely, 2^669633608 is an apocalyptic number.

It is an amenable number.

669633608 is an abundant number, since it is smaller than the sum of its proper divisors (792037627).

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

669633608 is an equidigital number, since it uses as much as digits as its factorization.

669633608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634 (or 1316 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 47.

The square root of 669633608 is about 25877.2797643029. The cubic root of 669633608 is about 874.8744779943.

Multiplying 669633608 by its product of nonzero digits (839808), we get a square (562363661067264 = 23714208²).

It can be divided in two parts, 6696 and 33608, that added together give a palindrome (40304).

The spelling of 669633608 in words is "six hundred sixty-nine million, six hundred thirty-three thousand, six hundred eight".