84861986779 has 2 divisors, whose sum is σ = 84861986780. Its totient is φ = 84861986778.

The previous prime is 84861986773. The next prime is 84861986801. The reversal of 84861986779 is 97768916848.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84861986779 - 2⁵ = 84861986747 is a prime.

It is not a weakly prime, because it can be changed into another prime (84861986773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42430993389 + 42430993390.

It is an arithmetic number, because the mean of its divisors is an integer number (42430993390).

Almost surely, 2^84861986779 is an apocalyptic number.

84861986779 is a deficient number, since it is larger than the sum of its proper divisors (1).

84861986779 is an equidigital number, since it uses as much as digits as its factorization.

84861986779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 292626432, while the sum is 73.

The spelling of 84861986779 in words is "eighty-four billion, eight hundred sixty-one million, nine hundred eighty-six thousand, seven hundred seventy-nine".