646513045364441 has 16 divisors (see below), whose sum is σ = 670797964112640. Its totient is φ = 622360921754880.

The previous prime is 646513045364429. The next prime is 646513045364471. The reversal of 646513045364441 is 144463540315646.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646513045364441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646513045364471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1180764026 + ... + 1181311436.

It is an arithmetic number, because the mean of its divisors is an integer number (41924872757040).

Almost surely, 2^{646513045364441} is an apocalyptic number.

It is an amenable number.

646513045364441 is a deficient number, since it is larger than the sum of its proper divisors (24284918748199).

646513045364441 is a wasteful number, since it uses less digits than its factorization.

646513045364441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668624.

The product of its (nonzero) digits is 49766400, while the sum is 56.

The spelling of 646513045364441 in words is "six hundred forty-six trillion, five hundred thirteen billion, forty-five million, three hundred sixty-four thousand, four hundred forty-one".