669372490209 has 8 divisors (see below), whose sum is σ = 893597145952. Its totient is φ = 445698080640.

The previous prime is 669372490169. The next prime is 669372490253. The reversal of 669372490209 is 902094273966.

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 669372490209 - 2⁷ = 669372490081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669372491209) 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, 137558704 + ... + 137563569.

It is an arithmetic number, because the mean of its divisors is an integer number (111699643244).

Almost surely, 2^669372490209 is an apocalyptic number.

It is an amenable number.

669372490209 is a deficient number, since it is larger than the sum of its proper divisors (224224655743).

669372490209 is a wasteful number, since it uses less digits than its factorization.

669372490209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275123087.

The product of its (nonzero) digits is 8817984, while the sum is 57.

The spelling of 669372490209 in words is "six hundred sixty-nine billion, three hundred seventy-two million, four hundred ninety thousand, two hundred nine".