84217558845 has 32 divisors (see below), whose sum is σ = 154025222400. Its totient is φ = 38492605440.

The previous prime is 84217558819. The next prime is 84217558847. The reversal of 84217558845 is 54885571248.

It is not a de Polignac number, because 84217558845 - 2⁸ = 84217558589 is a prime.

It is a super-2 number, since 2×84217558845² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84217558847) 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 in 31 ways as a sum of consecutive naturals, for example, 546981 + ... + 683829.

It is an arithmetic number, because the mean of its divisors is an integer number (4813288200).

Almost surely, 2^84217558845 is an apocalyptic number.

It is an amenable number.

84217558845 is a deficient number, since it is larger than the sum of its proper divisors (69807663555).

84217558845 is a wasteful number, since it uses less digits than its factorization.

84217558845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142725.

The product of its digits is 14336000, while the sum is 57.

The spelling of 84217558845 in words is "eighty-four billion, two hundred seventeen million, five hundred fifty-eight thousand, eight hundred forty-five".