665802347 has 6 divisors (see below), whose sum is σ = 774504828. Its totient is φ = 570687684.

The previous prime is 665802343. The next prime is 665802439. The reversal of 665802347 is 743208566.

It is a happy number.

It is not a de Polignac number, because 665802347 - 2² = 665802343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665802343) 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 5 ways as a sum of consecutive naturals, for example, 6793853 + ... + 6793950.

It is an arithmetic number, because the mean of its divisors is an integer number (129084138).

Almost surely, 2^665802347 is an apocalyptic number.

665802347 is a deficient number, since it is larger than the sum of its proper divisors (108702481).

665802347 is a wasteful number, since it uses less digits than its factorization.

665802347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13587817 (or 13587810 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 665802347 is about 25803.1460678732. The cubic root of 665802347 is about 873.2027750789.

The spelling of 665802347 in words is "six hundred sixty-five million, eight hundred two thousand, three hundred forty-seven".