646216651262512 has 20 divisors (see below), whose sum is σ = 1365867012896136. Its totient is φ = 293734841482880.

The previous prime is 646216651262489. The next prime is 646216651262531. The reversal of 646216651262512 is 215262156612646.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1835842759093 + ... + 1835842759444.

Almost surely, 2^{646216651262512} is an apocalyptic number.

It is an amenable number.

646216651262512 is an abundant number, since it is smaller than the sum of its proper divisors (719650361633624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646216651262512 is a wasteful number, since it uses less digits than its factorization.

646216651262512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3671685518556 (or 3671685518550 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 55.

The spelling of 646216651262512 in words is "six hundred forty-six trillion, two hundred sixteen billion, six hundred fifty-one million, two hundred sixty-two thousand, five hundred twelve".