84489170857 has 24 divisors (see below), whose sum is σ = 105989747136. Its totient is φ = 66756257568.

The previous prime is 84489170719. The next prime is 84489170863. The reversal of 84489170857 is 75807198448.

It is not a de Polignac number, because 84489170857 - 2¹¹ = 84489168809 is a prime.

It is a super-2 number, since 2×84489170857² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 84489170795 and 84489170804.

It is not an unprimeable number, because it can be changed into a prime (84489170057) 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 23 ways as a sum of consecutive naturals, for example, 371878 + ... + 554320.

It is an arithmetic number, because the mean of its divisors is an integer number (4416239464).

Almost surely, 2^84489170857 is an apocalyptic number.

It is an amenable number.

84489170857 is a deficient number, since it is larger than the sum of its proper divisors (21500576279).

84489170857 is a wasteful number, since it uses less digits than its factorization.

84489170857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183197 (or 183190 counting only the distinct ones).

The product of its (nonzero) digits is 18063360, while the sum is 61.

The spelling of 84489170857 in words is "eighty-four billion, four hundred eighty-nine million, one hundred seventy thousand, eight hundred fifty-seven".