669355585 has 4 divisors (see below), whose sum is σ = 803226708. Its totient is φ = 535484464.

The previous prime is 669355573. The next prime is 669355597. The reversal of 669355585 is 585553966.

It is a happy number.

669355585 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 585553966 = 2 ⋅292776983.

It is an interprime number because it is at equal distance from previous prime (669355573) and next prime (669355597).

It can be written as a sum of positive squares in 2 ways, for example, as 499209649 + 170145936 = 22343^2 + 13044^2 .

It is a cyclic number.

It is not a de Polignac number, because 669355585 - 2¹¹ = 669353537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66935554 + ... + 66935563.

It is an arithmetic number, because the mean of its divisors is an integer number (200806677).

Almost surely, 2^669355585 is an apocalyptic number.

It is an amenable number.

669355585 is a deficient number, since it is larger than the sum of its proper divisors (133871123).

669355585 is a wasteful number, since it uses less digits than its factorization.

669355585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133871122.

The product of its digits is 4860000, while the sum is 52.

The square root of 669355585 is about 25871.9072547812. The cubic root of 669355585 is about 874.7533824705.

The spelling of 669355585 in words is "six hundred sixty-nine million, three hundred fifty-five thousand, five hundred eighty-five".