669885691 has 8 divisors (see below), whose sum is σ = 688343040. Its totient is φ = 651559272.

The previous prime is 669885599. The next prime is 669885701. The reversal of 669885691 is 196588966.

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 669885691 - 2¹⁹ = 669361403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669885791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22315 + ... + 42868.

It is an arithmetic number, because the mean of its divisors is an integer number (86042880).

Almost surely, 2^669885691 is an apocalyptic number.

669885691 is a deficient number, since it is larger than the sum of its proper divisors (18457349).

669885691 is a wasteful number, since it uses less digits than its factorization.

669885691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65465.

The product of its digits is 5598720, while the sum is 58.

The square root of 669885691 is about 25882.1500459293. The cubic root of 669885691 is about 874.9842461381.

The spelling of 669885691 in words is "six hundred sixty-nine million, eight hundred eighty-five thousand, six hundred ninety-one".