665685347 has 8 divisors (see below), whose sum is σ = 669483792. Its totient is φ = 661897600.

The previous prime is 665685341. The next prime is 665685407. The reversal of 665685347 is 743586566.

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

It is a cyclic number.

It is not a de Polignac number, because 665685347 - 2⁴ = 665685331 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665685295 and 665685304.

It is not an unprimeable number, because it can be changed into a prime (665685341) 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, 144128 + ... + 148674.

It is an arithmetic number, because the mean of its divisors is an integer number (83685474).

Almost surely, 2^665685347 is an apocalyptic number.

665685347 is a deficient number, since it is larger than the sum of its proper divisors (3798445).

665685347 is a wasteful number, since it uses less digits than its factorization.

665685347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5349.

The product of its digits is 3628800, while the sum is 50.

The square root of 665685347 is about 25800.8788028625. The cubic root of 665685347 is about 873.1516234070.

The spelling of 665685347 in words is "six hundred sixty-five million, six hundred eighty-five thousand, three hundred forty-seven".