6864781453919 has 4 divisors (see below), whose sum is σ = 6866528666160. Its totient is φ = 6863034241680.

The previous prime is 6864781453913. The next prime is 6864781453921. The reversal of 6864781453919 is 9193541874686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6864781453919 is a prime.

It is a super-2 number, since 2×6864781453919² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6864781453913) 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, 873600227 + ... + 873608084.

It is an arithmetic number, because the mean of its divisors is an integer number (1716632166540).

Almost surely, 2^{6864781453919} is an apocalyptic number.

6864781453919 is a deficient number, since it is larger than the sum of its proper divisors (1747212241).

6864781453919 is a wasteful number, since it uses less digits than its factorization.

6864781453919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747212240.

The product of its digits is 313528320, while the sum is 71.

The spelling of 6864781453919 in words is "six trillion, eight hundred sixty-four billion, seven hundred eighty-one million, four hundred fifty-three thousand, nine hundred nineteen".