669106442 has 8 divisors (see below), whose sum is σ = 1003913796. Its totient is φ = 334468512.

The previous prime is 669106441. The next prime is 669106447. The reversal of 669106442 is 244601966.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 610139401 + 58967041 = 24701^2 + 7679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 669106396 and 669106405.

It is not an unprimeable number, because it can be changed into a prime (669106441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31973 + ... + 48584.

Almost surely, 2^669106442 is an apocalyptic number.

669106442 is a deficient number, since it is larger than the sum of its proper divisors (334807354).

669106442 is a wasteful number, since it uses less digits than its factorization.

669106442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84712.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 669106442 is about 25867.0918736529. The cubic root of 669106442 is about 874.6448374100.

The spelling of 669106442 in words is "six hundred sixty-nine million, one hundred six thousand, four hundred forty-two".