669906699 has 48 divisors (see below), whose sum is σ = 1160866560. Its totient is φ = 335966400.

The previous prime is 669906661. The next prime is 669906707. The reversal of 669906699 is 996609966.

It is not a de Polignac number, because 669906699 - 2⁸ = 669906443 is a prime.

669906699 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669906659) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69144 + ... + 78234.

It is an arithmetic number, because the mean of its divisors is an integer number (24184720).

Almost surely, 2^669906699 is an apocalyptic number.

669906699 is a deficient number, since it is larger than the sum of its proper divisors (490959861).

669906699 is a wasteful number, since it uses less digits than its factorization.

669906699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9152 (or 9141 counting only the distinct ones).

The product of its (nonzero) digits is 8503056, while the sum is 60.

The square root of 669906699 is about 25882.5558822926. Note that the first 3 decimals coincide. The cubic root of 669906699 is about 874.9933927120.

The spelling of 669906699 in words is "six hundred sixty-nine million, nine hundred six thousand, six hundred ninety-nine".