84821894865 has 96 divisors (see below), whose sum is σ = 153905581440. Its totient is φ = 43171688448.

The previous prime is 84821894863. The next prime is 84821894869. The reversal of 84821894865 is 56849812848.

84821894865 is a `hidden beast` number, since 8 + 482 + 1 + 8 + 94 + 8 + 65 = 666.

It is not a de Polignac number, because 84821894865 - 2¹ = 84821894863 is a prime.

It is a super-2 number, since 2×84821894865² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84821894863) 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 95 ways as a sum of consecutive naturals, for example, 66111514 + ... + 66112796.

It is an arithmetic number, because the mean of its divisors is an integer number (1603183140).

Almost surely, 2^84821894865 is an apocalyptic number.

It is an amenable number.

84821894865 is a deficient number, since it is larger than the sum of its proper divisors (69083686575).

84821894865 is a wasteful number, since it uses less digits than its factorization.

84821894865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063 (or 2060 counting only the distinct ones).

The product of its digits is 35389440, while the sum is 63.

The spelling of 84821894865 in words is "eighty-four billion, eight hundred twenty-one million, eight hundred ninety-four thousand, eight hundred sixty-five".