1978614783349 has 2 divisors, whose sum is σ = 1978614783350. Its totient is φ = 1978614783348.

The previous prime is 1978614783319. The next prime is 1978614783371. The reversal of 1978614783349 is 9433874168791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1978551692100 + 63091249 = 1406610^2 + 7943^2 .

It is a cyclic number.

It is not a de Polignac number, because 1978614783349 - 2¹¹ = 1978614781301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1978614783319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989307391674 + 989307391675.

It is an arithmetic number, because the mean of its divisors is an integer number (989307391675).

Almost surely, 2^{1978614783349} is an apocalyptic number.

It is an amenable number.

1978614783349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978614783349 is an equidigital number, since it uses as much as digits as its factorization.

1978614783349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 219469824, while the sum is 70.

The spelling of 1978614783349 in words is "one trillion, nine hundred seventy-eight billion, six hundred fourteen million, seven hundred eighty-three thousand, three hundred forty-nine".