646634343016 has 8 divisors (see below), whose sum is σ = 1212439393170. Its totient is φ = 323317171504.

The previous prime is 646634342989. The next prime is 646634343023. The reversal of 646634343016 is 610343436646.

It can be written as a sum of positive squares in only one way, i.e., 646271288100 + 363054916 = 803910^2 + 19054^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 40414646431 + ... + 40414646446.

Almost surely, 2^646634343016 is an apocalyptic number.

It is an amenable number.

646634343016 is a deficient number, since it is larger than the sum of its proper divisors (565805050154).

646634343016 is a wasteful number, since it uses less digits than its factorization.

646634343016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80829292883 (or 80829292879 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 46.

The spelling of 646634343016 in words is "six hundred forty-six billion, six hundred thirty-four million, three hundred forty-three thousand, sixteen".