664423357217 has 16 divisors (see below), whose sum is σ = 682192228032. Its totient is φ = 646730177280.

The previous prime is 664423357211. The next prime is 664423357223. The reversal of 664423357217 is 712753324466.

It is an interprime number because it is at equal distance from previous prime (664423357211) and next prime (664423357223).

It is a cyclic number.

It is not a de Polignac number, because 664423357217 - 2²⁴ = 664406580001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664423357211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52322813 + ... + 52335509.

It is an arithmetic number, because the mean of its divisors is an integer number (42637014252).

Almost surely, 2^664423357217 is an apocalyptic number.

It is an amenable number.

664423357217 is a deficient number, since it is larger than the sum of its proper divisors (17768870815).

664423357217 is a wasteful number, since it uses less digits than its factorization.

664423357217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15568.

The product of its digits is 5080320, while the sum is 50.

The spelling of 664423357217 in words is "six hundred sixty-four billion, four hundred twenty-three million, three hundred fifty-seven thousand, two hundred seventeen".