84277527781 has 2 divisors, whose sum is σ = 84277527782. Its totient is φ = 84277527780.

The previous prime is 84277527779. The next prime is 84277527823. The reversal of 84277527781 is 18772577248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79148819556 + 5128708225 = 281334^2 + 71615^2 .

It is a cyclic number.

It is not a de Polignac number, because 84277527781 - 2¹ = 84277527779 is a prime.

It is a super-2 number, since 2×84277527781² (a number of 23 digits) contains 22 as substring.

Together with 84277527779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84277527181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42138763890 + 42138763891.

It is an arithmetic number, because the mean of its divisors is an integer number (42138763891).

Almost surely, 2^84277527781 is an apocalyptic number.

It is an amenable number.

84277527781 is a deficient number, since it is larger than the sum of its proper divisors (1).

84277527781 is an equidigital number, since it uses as much as digits as its factorization.

84277527781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12293120, while the sum is 58.

The spelling of 84277527781 in words is "eighty-four billion, two hundred seventy-seven million, five hundred twenty-seven thousand, seven hundred eighty-one".