84210539779 has 2 divisors, whose sum is σ = 84210539780. Its totient is φ = 84210539778.

The previous prime is 84210539687. The next prime is 84210539857. The reversal of 84210539779 is 97793501248.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84210539779 - 2³³ = 75620605187 is a prime.

It is not a weakly prime, because it can be changed into another prime (84210533779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42105269889 + 42105269890.

It is an arithmetic number, because the mean of its divisors is an integer number (42105269890).

Almost surely, 2^84210539779 is an apocalyptic number.

84210539779 is a deficient number, since it is larger than the sum of its proper divisors (1).

84210539779 is an equidigital number, since it uses as much as digits as its factorization.

84210539779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 84210539779 in words is "eighty-four billion, two hundred ten million, five hundred thirty-nine thousand, seven hundred seventy-nine".