84136621489 has 2 divisors, whose sum is σ = 84136621490. Its totient is φ = 84136621488.

The previous prime is 84136621469. The next prime is 84136621661. The reversal of 84136621489 is 98412663148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71511851889 + 12624769600 = 267417^2 + 112360^2 .

It is a cyclic number.

It is not a de Polignac number, because 84136621489 - 2¹⁵ = 84136588721 is a prime.

It is not a weakly prime, because it can be changed into another prime (84136621409) 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, 42068310744 + 42068310745.

It is an arithmetic number, because the mean of its divisors is an integer number (42068310745).

Almost surely, 2^84136621489 is an apocalyptic number.

It is an amenable number.

84136621489 is a deficient number, since it is larger than the sum of its proper divisors (1).

84136621489 is an equidigital number, since it uses as much as digits as its factorization.

84136621489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1990656, while the sum is 52.

The spelling of 84136621489 in words is "eighty-four billion, one hundred thirty-six million, six hundred twenty-one thousand, four hundred eighty-nine".