646513011155444 has 12 divisors (see below), whose sum is σ = 1131397951956384. Its totient is φ = 323256453453624.

The previous prime is 646513011155411. The next prime is 646513011155449. The reversal of 646513011155444 is 444551110315646.

It is a junction number, because it is equal to n+sod(n) for n = 646513011155392 and 646513011155401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646513011155449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32738777 + ... + 48629759.

It is an arithmetic number, because the mean of its divisors is an integer number (94283162663032).

Almost surely, 2^{646513011155444} is an apocalyptic number.

It is an amenable number.

646513011155444 is a deficient number, since it is larger than the sum of its proper divisors (484884940800940).

646513011155444 is a wasteful number, since it uses less digits than its factorization.

646513011155444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26062054 (or 26062052 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 50.

The spelling of 646513011155444 in words is "six hundred forty-six trillion, five hundred thirteen billion, eleven million, one hundred fifty-five thousand, four hundred forty-four".