646682116829 has 8 divisors (see below), whose sum is σ = 754148241600. Its totient is φ = 554298956988.

The previous prime is 646682116819. The next prime is 646682116849. The reversal of 646682116829 is 928611286646.

It is a happy number.

It is not a de Polignac number, because 646682116829 - 2⁸ = 646682116573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646682116819) 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, 942684959 + ... + 942685644.

It is an arithmetic number, because the mean of its divisors is an integer number (94268530200).

Almost surely, 2^646682116829 is an apocalyptic number.

It is an amenable number.

646682116829 is a deficient number, since it is larger than the sum of its proper divisors (107466124771).

646682116829 is an equidigital number, since it uses as much as digits as its factorization.

646682116829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1885370624 (or 1885370610 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 59.

The spelling of 646682116829 in words is "six hundred forty-six billion, six hundred eighty-two million, one hundred sixteen thousand, eight hundred twenty-nine".