646052717 has 4 divisors (see below), whose sum is σ = 684055836. Its totient is φ = 608049600.

The previous prime is 646052713. The next prime is 646052731. The reversal of 646052717 is 717250646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 291521476 + 354531241 = 17074^2 + 18829^2 .

It is a cyclic number.

It is not a de Polignac number, because 646052717 - 2² = 646052713 is a prime.

It is a super-2 number, since 2×646052717² = 834768226286164178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646052711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19001534 + ... + 19001567.

It is an arithmetic number, because the mean of its divisors is an integer number (171013959).

Almost surely, 2^646052717 is an apocalyptic number.

It is an amenable number.

646052717 is a deficient number, since it is larger than the sum of its proper divisors (38003119).

646052717 is a wasteful number, since it uses less digits than its factorization.

646052717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38003118.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 646052717 is about 25417.5670944329. The cubic root of 646052717 is about 864.4820613243.

The spelling of 646052717 in words is "six hundred forty-six million, fifty-two thousand, seven hundred seventeen".