646609802795713 has 8 divisors (see below), whose sum is σ = 684700793784360. Its totient is φ = 608524936277760.

The previous prime is 646609802795699. The next prime is 646609802795797. The reversal of 646609802795713 is 317597208906646.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 474594590476864 + 172015212318849 = 21785192^2 + 13115457^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646609802795713 is a prime.

It is a super-2 number, since 2×646609802795713² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646609802795413) 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, 1530900298 + ... + 1531322611.

It is an arithmetic number, because the mean of its divisors is an integer number (85587599223045).

It is a 1-persistent number, because it is pandigital, but 2⋅646609802795713 = 1293219605591426 is not.

Almost surely, 2^{646609802795713} is an apocalyptic number.

It is an amenable number.

646609802795713 is a deficient number, since it is larger than the sum of its proper divisors (38090990988647).

646609802795713 is a wasteful number, since it uses less digits than its factorization.

646609802795713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3062235347.

The product of its (nonzero) digits is 823011840, while the sum is 73.

The spelling of 646609802795713 in words is "six hundred forty-six trillion, six hundred nine billion, eight hundred two million, seven hundred ninety-five thousand, seven hundred thirteen".