665505633 has 16 divisors (see below), whose sum is σ = 956200896. Its totient is φ = 409283520.

The previous prime is 665505619. The next prime is 665505637. The reversal of 665505633 is 336505566.

It is not a de Polignac number, because 665505633 - 2¹⁴ = 665489249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 665505591 and 665505600.

It is not an unprimeable number, because it can be changed into a prime (665505637) 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, 70891 + ... + 79727.

It is an arithmetic number, because the mean of its divisors is an integer number (59762556).

Almost surely, 2^665505633 is an apocalyptic number.

It is an amenable number.

665505633 is a deficient number, since it is larger than the sum of its proper divisors (290695263).

665505633 is a wasteful number, since it uses less digits than its factorization.

665505633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10784.

The product of its (nonzero) digits is 243000, while the sum is 39.

The square root of 665505633 is about 25797.3958569465. The cubic root of 665505633 is about 873.0730418896.

The spelling of 665505633 in words is "six hundred sixty-five million, five hundred five thousand, six hundred thirty-three".