6541778752 has 14 divisors (see below), whose sum is σ = 12981342338. Its totient is φ = 3270889344.

The previous prime is 6541778731. The next prime is 6541778779. The reversal of 6541778752 is 2578771456.

It can be written as a sum of positive squares in only one way, i.e., 5232496896 + 1309281856 = 72336^2 + 36184^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6541778752.

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, 51107583 + ... + 51107710.

Almost surely, 2^6541778752 is an apocalyptic number.

It is an amenable number.

6541778752 is a deficient number, since it is larger than the sum of its proper divisors (6439563586).

6541778752 is a wasteful number, since it uses less digits than its factorization.

6541778752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102215305 (or 102215295 counting only the distinct ones).

The product of its digits is 3292800, while the sum is 52.

The square root of 6541778752 is about 80881.2632937938. The cubic root of 6541778752 is about 1870.2454949511.

The spelling of 6541778752 in words is "six billion, five hundred forty-one million, seven hundred seventy-eight thousand, seven hundred fifty-two".