646311044655 has 48 divisors (see below), whose sum is σ = 1122305184000. Its totient is φ = 344074272768.

The previous prime is 646311044653. The next prime is 646311044683. The reversal of 646311044655 is 556440113646.

646311044655 is a `hidden beast` number, since 6 + 4 + 631 + 1 + 0 + 4 + 4 + 6 + 5 + 5 = 666.

It is not a de Polignac number, because 646311044655 - 2¹ = 646311044653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 646311044655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646311044653) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 94087561 + ... + 94094429.

It is an arithmetic number, because the mean of its divisors is an integer number (23381358000).

Almost surely, 2^646311044655 is an apocalyptic number.

646311044655 is a deficient number, since it is larger than the sum of its proper divisors (475994139345).

646311044655 is a wasteful number, since it uses less digits than its factorization.

646311044655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10368 (or 10365 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 646311044655 in words is "six hundred forty-six billion, three hundred eleven million, forty-four thousand, six hundred fifty-five".