669887659 has 16 divisors (see below), whose sum is σ = 773178048. Its totient is φ = 568524672.

The previous prime is 669887657. The next prime is 669887671. The reversal of 669887659 is 956788966.

It is a cyclic number.

It is not a de Polignac number, because 669887659 - 2¹ = 669887657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 669887659.

It is not an unprimeable number, because it can be changed into a prime (669887657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334449 + ... + 336445.

It is an arithmetic number, because the mean of its divisors is an integer number (48323628).

Almost surely, 2^669887659 is an apocalyptic number.

669887659 is a deficient number, since it is larger than the sum of its proper divisors (103290389).

669887659 is a wasteful number, since it uses less digits than its factorization.

669887659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2454.

The product of its digits is 39191040, while the sum is 64.

The square root of 669887659 is about 25882.1880643813. The cubic root of 669887659 is about 874.9851029845.

It can be divided in two parts, 66988 and 7659, that added together give a palindrome (74647).

The spelling of 669887659 in words is "six hundred sixty-nine million, eight hundred eighty-seven thousand, six hundred fifty-nine".