669928065 has 16 divisors (see below), whose sum is σ = 1075966848. Its totient is φ = 355934336.

The previous prime is 669928037. The next prime is 669928093. The reversal of 669928065 is 560829966.

669928065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (669928037) and next prime (669928093).

It is a cyclic number.

It is not a de Polignac number, because 669928065 - 2⁵ = 669928033 is a prime.

It is a super-2 number, since 2×669928065² = 897607224549288450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 669927999 and 669928017.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80964 + ... + 88853.

It is an arithmetic number, because the mean of its divisors is an integer number (67247928).

Almost surely, 2^669928065 is an apocalyptic number.

It is an amenable number.

669928065 is a deficient number, since it is larger than the sum of its proper divisors (406038783).

669928065 is a wasteful number, since it uses less digits than its factorization.

669928065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170088.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 669928065 is about 25882.9686280380. The cubic root of 669928065 is about 875.0026949577.

It can be divided in two parts, 66992 and 8065, that added together give a palindrome (75057).

The spelling of 669928065 in words is "six hundred sixty-nine million, nine hundred twenty-eight thousand, sixty-five".