665040267 has 16 divisors (see below), whose sum is σ = 1019220000. Its totient is φ = 428071392.

The previous prime is 665040263. The next prime is 665040281. The reversal of 665040267 is 762040566.

It is not a de Polignac number, because 665040267 - 2² = 665040263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665040263) 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 15 ways as a sum of consecutive naturals, for example, 423892 + ... + 425457.

It is an arithmetic number, because the mean of its divisors is an integer number (63701250).

Almost surely, 2^665040267 is an apocalyptic number.

665040267 is a deficient number, since it is larger than the sum of its proper divisors (354179733).

665040267 is a wasteful number, since it uses less digits than its factorization.

665040267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849387 (or 849381 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 665040267 is about 25788.3746482790. The cubic root of 665040267 is about 872.8694907702.

The spelling of 665040267 in words is "six hundred sixty-five million, forty thousand, two hundred sixty-seven".