669421417 has 8 divisors (see below), whose sum is σ = 798316416. Its totient is φ = 548842272.

The previous prime is 669421399. The next prime is 669421439. The reversal of 669421417 is 714124966.

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 669421417 - 2⁷ = 669421289 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 669421417.

It is not an unprimeable number, because it can be changed into a prime (669421457) 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, 2078788 + ... + 2079109.

It is an arithmetic number, because the mean of its divisors is an integer number (99789552).

Almost surely, 2^669421417 is an apocalyptic number.

It is an amenable number.

669421417 is a deficient number, since it is larger than the sum of its proper divisors (128894999).

669421417 is a wasteful number, since it uses less digits than its factorization.

669421417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4157927.

The product of its digits is 72576, while the sum is 40.

The square root of 669421417 is about 25873.1794915121. The cubic root of 669421417 is about 874.7820592447.

The spelling of 669421417 in words is "six hundred sixty-nine million, four hundred twenty-one thousand, four hundred seventeen".