646609802795712 has 280 divisors, whose sum is σ = 2190884262107904. Its totient is φ = 184719662120448.

The previous prime is 646609802795699. The next prime is 646609802795797. The reversal of 646609802795712 is 217597208906646.

646609802795712 is a `hidden beast` number, since 6 + 4 + 6 + 609 + 8 + 0 + 2 + 7 + 9 + 5 + 7 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 257374483 + ... + 259874669.

Almost surely, 2^{646609802795712} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646609802795712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1095442131053952).

646609802795712 is an abundant number, since it is smaller than the sum of its proper divisors (1544274459312192).

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

646609802795712 is a wasteful number, since it uses less digits than its factorization.

646609802795712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2507345 (or 2507326 counting only the distinct ones).

The product of its (nonzero) digits is 548674560, while the sum is 72.

The spelling of 646609802795712 in words is "six hundred forty-six trillion, six hundred nine billion, eight hundred two million, seven hundred ninety-five thousand, seven hundred twelve".