6643702838455 has 16 divisors (see below), whose sum is σ = 8392263822720. Its totient is φ = 5035096535328.

The previous prime is 6643702838429. The next prime is 6643702838467. The reversal of 6643702838455 is 5548382073466.

It is a cyclic number.

It is not a de Polignac number, because 6643702838455 - 2³¹ = 6641555354807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6643702838393 and 6643702838402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2846464 + ... + 4624906.

It is an arithmetic number, because the mean of its divisors is an integer number (524516488920).

Almost surely, 2^{6643702838455} is an apocalyptic number.

6643702838455 is a deficient number, since it is larger than the sum of its proper divisors (1748560984265).

6643702838455 is a wasteful number, since it uses less digits than its factorization.

6643702838455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817790.

The product of its (nonzero) digits is 116121600, while the sum is 61.

The spelling of 6643702838455 in words is "six trillion, six hundred forty-three billion, seven hundred two million, eight hundred thirty-eight thousand, four hundred fifty-five".