7778889983 has 2 divisors, whose sum is σ = 7778889984. Its totient is φ = 7778889982.

The previous prime is 7778889949. The next prime is 7778890057. The reversal of 7778889983 is 3899888777.

It is an a-pointer prime, because the next prime (7778890057) can be obtained adding 7778889983 to its sum of digits (74).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7778889983 - 2²⁴ = 7762112767 is a prime.

It is a super-3 number, since 3×7778889983³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7778889983.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7778889383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3889444991 + 3889444992.

It is an arithmetic number, because the mean of its divisors is an integer number (3889444992).

Almost surely, 2^7778889983 is an apocalyptic number.

7778889983 is a deficient number, since it is larger than the sum of its proper divisors (1).

7778889983 is an equidigital number, since it uses as much as digits as its factorization.

7778889983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 341397504, while the sum is 74.

The square root of 7778889983 is about 88198.0157543241. The cubic root of 7778889983 is about 1981.4017539584.

The spelling of 7778889983 in words is "seven billion, seven hundred seventy-eight million, eight hundred eighty-nine thousand, nine hundred eighty-three".