84164721720 has 64 divisors (see below), whose sum is σ = 257866398720. Its totient is φ = 21966393984.

The previous prime is 84164721691. The next prime is 84164721727. The reversal of 84164721720 is 2712746148.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84164721727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7455772 + ... + 7467051.

It is an arithmetic number, because the mean of its divisors is an integer number (4029162480).

Almost surely, 2^84164721720 is an apocalyptic number.

It is an amenable number.

84164721720 is an abundant number, since it is smaller than the sum of its proper divisors (173701677000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84164721720 is a wasteful number, since it uses less digits than its factorization.

84164721720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14922884 (or 14922880 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The spelling of 84164721720 in words is "eighty-four billion, one hundred sixty-four million, seven hundred twenty-one thousand, seven hundred twenty".