669826731909 has 8 divisors (see below), whose sum is σ = 893121079552. Its totient is φ = 446541769440.

The previous prime is 669826731869. The next prime is 669826731911. The reversal of 669826731909 is 909137628966.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 669826731909 - 2⁷ = 669826731781 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 669826731909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669826731979) 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, 2178037 + ... + 2466474.

It is an arithmetic number, because the mean of its divisors is an integer number (111640134944).

Almost surely, 2^669826731909 is an apocalyptic number.

It is an amenable number.

669826731909 is a deficient number, since it is larger than the sum of its proper divisors (223294347643).

669826731909 is a wasteful number, since it uses less digits than its factorization.

669826731909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4692587.

The product of its (nonzero) digits is 52907904, while the sum is 66.

The spelling of 669826731909 in words is "six hundred sixty-nine billion, eight hundred twenty-six million, seven hundred thirty-one thousand, nine hundred nine".