669249347 has 4 divisors (see below), whose sum is σ = 720730080. Its totient is φ = 617768616.

The previous prime is 669249341. The next prime is 669249349. The reversal of 669249347 is 743942966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 669249347 - 2⁶ = 669249283 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 669249295 and 669249304.

It is not an unprimeable number, because it can be changed into a prime (669249341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25740347 + ... + 25740372.

It is an arithmetic number, because the mean of its divisors is an integer number (180182520).

Almost surely, 2^669249347 is an apocalyptic number.

669249347 is a deficient number, since it is larger than the sum of its proper divisors (51480733).

669249347 is a wasteful number, since it uses less digits than its factorization.

669249347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51480732.

The product of its digits is 1959552, while the sum is 50.

The square root of 669249347 is about 25869.8540196886. The cubic root of 669249347 is about 874.7071006591.

The spelling of 669249347 in words is "six hundred sixty-nine million, two hundred forty-nine thousand, three hundred forty-seven".