6543784894 has 4 divisors (see below), whose sum is σ = 9815677344. Its totient is φ = 3271892446.

The previous prime is 6543784829. The next prime is 6543784903. The reversal of 6543784894 is 4984873456.

It is a happy number.

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

It is a super-2 number, since 2×6543784894² = 85642241477885182472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1635946222 + ... + 1635946225.

It is an arithmetic number, because the mean of its divisors is an integer number (2453919336).

Almost surely, 2^6543784894 is an apocalyptic number.

6543784894 is a deficient number, since it is larger than the sum of its proper divisors (3271892450).

6543784894 is a wasteful number, since it uses less digits than its factorization.

6543784894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3271892449.

The product of its digits is 23224320, while the sum is 58.

The square root of 6543784894 is about 80893.6641153063. The cubic root of 6543784894 is about 1870.4366557301.

The spelling of 6543784894 in words is "six billion, five hundred forty-three million, seven hundred eighty-four thousand, eight hundred ninety-four".