6778939983 has 8 divisors (see below), whose sum is σ = 9431568768. Its totient is φ = 4322802264.

The previous prime is 6778939949. The next prime is 6778939991. The reversal of 6778939983 is 3899398776.

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

It is a de Polignac number, because none of the positive numbers 2^k-6778939983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69), and also a Moran number because the ratio is a prime number: 98245507 = 6778939983 / (6 + 7 + 7 + 8 + 9 + 3 + 9 + 9 + 8 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6778939903) 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, 49122685 + ... + 49122822.

It is an arithmetic number, because the mean of its divisors is an integer number (1178946096).

Almost surely, 2^6778939983 is an apocalyptic number.

6778939983 is a deficient number, since it is larger than the sum of its proper divisors (2652628785).

6778939983 is a wasteful number, since it uses less digits than its factorization.

6778939983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98245533.

The product of its digits is 123451776, while the sum is 69.

The square root of 6778939983 is about 82334.3183793975. The cubic root of 6778939983 is about 1892.5786198999.

The spelling of 6778939983 in words is "six billion, seven hundred seventy-eight million, nine hundred thirty-nine thousand, nine hundred eighty-three".