669675447 has 24 divisors (see below), whose sum is σ = 1106493440. Its totient is φ = 382326480.

The previous prime is 669675431. The next prime is 669675449. The reversal of 669675447 is 744576966.

669675447 is a `hidden beast` number, since 6 + 6 + 96 + 7 + 544 + 7 = 666.

It is not a de Polignac number, because 669675447 - 2⁴ = 669675431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 669675393 and 669675402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669675449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76422 + ... + 84732.

Almost surely, 2^669675447 is an apocalyptic number.

669675447 is a deficient number, since it is larger than the sum of its proper divisors (436817993).

669675447 is a wasteful number, since it uses less digits than its factorization.

669675447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9603 (or 9600 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 54.

The square root of 669675447 is about 25878.0881635410. The cubic root of 669675447 is about 874.8926984612.

The spelling of 669675447 in words is "six hundred sixty-nine million, six hundred seventy-five thousand, four hundred forty-seven".