665330385 has 8 divisors (see below), whose sum is σ = 1064528640. Its totient is φ = 354842864.

The previous prime is 665330381. The next prime is 665330461. The reversal of 665330385 is 583033566.

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 665330385 - 2² = 665330381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665330381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22177665 + ... + 22177694.

It is an arithmetic number, because the mean of its divisors is an integer number (133066080).

Almost surely, 2^665330385 is an apocalyptic number.

It is an amenable number.

665330385 is a deficient number, since it is larger than the sum of its proper divisors (399198255).

665330385 is a wasteful number, since it uses less digits than its factorization.

665330385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44355367.

The product of its (nonzero) digits is 194400, while the sum is 39.

The square root of 665330385 is about 25793.9990113980. Note that the first 3 decimals coincide. The cubic root of 665330385 is about 872.9963995448.

The spelling of 665330385 in words is "six hundred sixty-five million, three hundred thirty thousand, three hundred eighty-five".