669888699 has 16 divisors (see below), whose sum is σ = 904922880. Its totient is φ = 440762400.

The previous prime is 669888679. The next prime is 669888707. The reversal of 669888699 is 996888966.

It is not a de Polignac number, because 669888699 - 2¹⁶ = 669823163 is a prime.

669888699 is a strobogrammatic number because it is the same when read upside-down.

It is not an unprimeable number, because it can be changed into a prime (669888679) 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, 66412 + ... + 75830.

It is an arithmetic number, because the mean of its divisors is an integer number (56557680).

Almost surely, 2^669888699 is an apocalyptic number.

669888699 is a deficient number, since it is larger than the sum of its proper divisors (235034181).

669888699 is a wasteful number, since it uses less digits than its factorization.

669888699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9730.

The product of its digits is 80621568, while the sum is 69.

The square root of 669888699 is about 25882.2081554105. The cubic root of 669888699 is about 874.9855557888.

The spelling of 669888699 in words is "six hundred sixty-nine million, eight hundred eighty-eight thousand, six hundred ninety-nine".