646337382329 has 4 divisors (see below), whose sum is σ = 651426653184. Its totient is φ = 641248111476.

The previous prime is 646337382319. The next prime is 646337382343. The reversal of 646337382329 is 923283733646.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 646337382329 - 2⁸ = 646337382073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646337382319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2544635237 + ... + 2544635490.

It is an arithmetic number, because the mean of its divisors is an integer number (162856663296).

Almost surely, 2^646337382329 is an apocalyptic number.

It is an amenable number.

646337382329 is a deficient number, since it is larger than the sum of its proper divisors (5089270855).

646337382329 is a wasteful number, since it uses less digits than its factorization.

646337382329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5089270854.

The product of its digits is 23514624, while the sum is 56.

The spelling of 646337382329 in words is "six hundred forty-six billion, three hundred thirty-seven million, three hundred eighty-two thousand, three hundred twenty-nine".