84861984779 has 16 divisors (see below), whose sum is σ = 100214598624. Its totient is φ = 70843852800.

The previous prime is 84861984763. The next prime is 84861984829. The reversal of 84861984779 is 97748916848.

It is a cyclic number.

It is not a de Polignac number, because 84861984779 - 2⁴ = 84861984763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84861986779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1509812 + ... + 1565009.

It is an arithmetic number, because the mean of its divisors is an integer number (6263412414).

Almost surely, 2^84861984779 is an apocalyptic number.

84861984779 is a deficient number, since it is larger than the sum of its proper divisors (15352613845).

84861984779 is a wasteful number, since it uses less digits than its factorization.

84861984779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3075038.

The product of its digits is 195084288, while the sum is 71.

The spelling of 84861984779 in words is "eighty-four billion, eight hundred sixty-one million, nine hundred eighty-four thousand, seven hundred seventy-nine".