6778405943 has 8 divisors (see below), whose sum is σ = 6811831728. Its totient is φ = 6745017664.

The previous prime is 6778405939. The next prime is 6778405979. The reversal of 6778405943 is 3495048776.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6778405943 - 2² = 6778405939 is a prime.

It is a super-4 number, since 4×6778405943⁴ (a number of 40 digits) contains 4444 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 (6778405043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395396 + ... + 412182.

It is an arithmetic number, because the mean of its divisors is an integer number (851478966).

Almost surely, 2^6778405943 is an apocalyptic number.

6778405943 is a deficient number, since it is larger than the sum of its proper divisors (33425785).

6778405943 is a wasteful number, since it uses less digits than its factorization.

6778405943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18753.

The product of its (nonzero) digits is 5080320, while the sum is 53.

The square root of 6778405943 is about 82331.0751964287. The cubic root of 6778405943 is about 1892.5289199354.

The spelling of 6778405943 in words is "six billion, seven hundred seventy-eight million, four hundred five thousand, nine hundred forty-three".