84487777778441 has 2 divisors, whose sum is σ = 84487777778442. Its totient is φ = 84487777778440.

The previous prime is 84487777778413. The next prime is 84487777778461. The reversal of 84487777778441 is 14487777778448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73835524417600 + 10652253360841 = 8592760^2 + 3263779^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84487777778441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84487777778441.

It is not a weakly prime, because it can be changed into another prime (84487777778461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42243888889220 + 42243888889221.

It is an arithmetic number, because the mean of its divisors is an integer number (42243888889221).

Almost surely, 2^{84487777778441} is an apocalyptic number.

It is an amenable number.

84487777778441 is a deficient number, since it is larger than the sum of its proper divisors (1).

84487777778441 is an equidigital number, since it uses as much as digits as its factorization.

84487777778441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15420489728, while the sum is 83.

The spelling of 84487777778441 in words is "eighty-four trillion, four hundred eighty-seven billion, seven hundred seventy-seven million, seven hundred seventy-eight thousand, four hundred forty-one".