669479009 has 8 divisors (see below), whose sum is σ = 704771712. Its totient is φ = 634701760.

The previous prime is 669478993. The next prime is 669479029. The reversal of 669479009 is 900974966.

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 669479009 - 2⁴ = 669478993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669479029) 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, 126197 + ... + 131394.

It is an arithmetic number, because the mean of its divisors is an integer number (88096464).

Almost surely, 2^669479009 is an apocalyptic number.

It is an amenable number.

669479009 is a deficient number, since it is larger than the sum of its proper divisors (35292703).

669479009 is a wasteful number, since it uses less digits than its factorization.

669479009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257727.

The product of its (nonzero) digits is 734832, while the sum is 50.

The square root of 669479009 is about 25874.2924347701. The cubic root of 669479009 is about 874.8071450887.

The spelling of 669479009 in words is "six hundred sixty-nine million, four hundred seventy-nine thousand, nine".