84999999999999 has 24 divisors (see below), whose sum is σ = 137568766642560. Its totient is φ = 46459627327344.

The previous prime is 84999999999977. The next prime is 85000000000009. The reversal of 84999999999999 is 99999999999948.

It is not a de Polignac number, because 84999999999999 - 2⁸ = 84999999999743 is a prime.

It is a super-9 number, since 9×84999999999999⁹ (a number of 127 digits) contains 999999999 as substring.

84999999999999 is a modest number, since divided by 9999999 gives 8499999 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84999999999919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12570242109 + ... + 12570248870.

It is an arithmetic number, because the mean of its divisors is an integer number (5732031943440).

Almost surely, 2^{84999999999999} is an apocalyptic number.

84999999999999 is a deficient number, since it is larger than the sum of its proper divisors (52568766642561).

84999999999999 is a wasteful number, since it uses less digits than its factorization.

84999999999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25140491019 (or 25140491012 counting only the distinct ones).

The product of its digits is 9037745167392, while the sum is 120.

The spelling of 84999999999999 in words is "eighty-four trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".