84871721859 has 16 divisors (see below), whose sum is σ = 119830233600. Its totient is φ = 53247808640.

The previous prime is 84871721827. The next prime is 84871721887. The reversal of 84871721859 is 95812717848.

It is a cyclic number.

It is not a de Polignac number, because 84871721859 - 2⁵ = 84871721827 is a prime.

It is a super-2 number, since 2×84871721859² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84871721659) 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, 508354 + ... + 654344.

It is an arithmetic number, because the mean of its divisors is an integer number (7489389600).

Almost surely, 2^84871721859 is an apocalyptic number.

84871721859 is a deficient number, since it is larger than the sum of its proper divisors (34958511741).

84871721859 is a wasteful number, since it uses less digits than its factorization.

84871721859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157410.

The product of its digits is 9031680, while the sum is 60.

The spelling of 84871721859 in words is "eighty-four billion, eight hundred seventy-one million, seven hundred twenty-one thousand, eight hundred fifty-nine".