669906811 has 16 divisors (see below), whose sum is σ = 811482624. Its totient is φ = 539869824.

The previous prime is 669906799. The next prime is 669906817. The reversal of 669906811 is 118609966.

It is a cyclic number.

It is not a de Polignac number, because 669906811 - 2⁵ = 669906779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (669906817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143236 + ... + 147838.

It is an arithmetic number, because the mean of its divisors is an integer number (50717664).

Almost surely, 2^669906811 is an apocalyptic number.

669906811 is a deficient number, since it is larger than the sum of its proper divisors (141575813).

669906811 is a wasteful number, since it uses less digits than its factorization.

669906811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5850.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 669906811 is about 25882.5580459119. The cubic root of 669906811 is about 874.9934414747.

The spelling of 669906811 in words is "six hundred sixty-nine million, nine hundred six thousand, eight hundred eleven".