6866811538544 has 40 divisors (see below), whose sum is σ = 13322351496480. Its totient is φ = 3428787283200.

The previous prime is 6866811538541. The next prime is 6866811538577. The reversal of 6866811538544 is 4458351186686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6866811538541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59066714 + ... + 59182854.

It is an arithmetic number, because the mean of its divisors is an integer number (333058787412).

Almost surely, 2^{6866811538544} is an apocalyptic number.

It is an amenable number.

6866811538544 is a deficient number, since it is larger than the sum of its proper divisors (6455539957936).

6866811538544 is a wasteful number, since it uses less digits than its factorization.

6866811538544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121089 (or 121083 counting only the distinct ones).

The product of its digits is 132710400, while the sum is 65.

The spelling of 6866811538544 in words is "six trillion, eight hundred sixty-six billion, eight hundred eleven million, five hundred thirty-eight thousand, five hundred forty-four".