665505145 has 8 divisors (see below), whose sum is σ = 806360256. Its totient is φ = 527234736.

The previous prime is 665505143. The next prime is 665505151. The reversal of 665505145 is 541505566.

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 665505145 - 2¹ = 665505143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665505143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 645607 + ... + 646636.

It is an arithmetic number, because the mean of its divisors is an integer number (100795032).

Almost surely, 2^665505145 is an apocalyptic number.

It is an amenable number.

665505145 is a deficient number, since it is larger than the sum of its proper divisors (140855111).

665505145 is a wasteful number, since it uses less digits than its factorization.

665505145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292351.

The product of its (nonzero) digits is 90000, while the sum is 37.

The square root of 665505145 is about 25797.3863986257. The cubic root of 665505145 is about 873.0728284881.

The spelling of 665505145 in words is "six hundred sixty-five million, five hundred five thousand, one hundred forty-five".