669617985 has 8 divisors (see below), whose sum is σ = 1071388800. Its totient is φ = 357129584.

The previous prime is 669617959. The next prime is 669618017. The reversal of 669617985 is 589716966.

It is a happy number.

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 669617985 - 2¹⁴ = 669601601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22320585 + ... + 22320614.

It is an arithmetic number, because the mean of its divisors is an integer number (133923600).

Almost surely, 2^669617985 is an apocalyptic number.

It is an amenable number.

669617985 is a deficient number, since it is larger than the sum of its proper divisors (401770815).

669617985 is a wasteful number, since it uses less digits than its factorization.

669617985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44641207.

The product of its digits is 4898880, while the sum is 57.

The square root of 669617985 is about 25876.9778954189. The cubic root of 669617985 is about 874.8676741391.

The spelling of 669617985 in words is "six hundred sixty-nine million, six hundred seventeen thousand, nine hundred eighty-five".