84521591056 has 40 divisors (see below), whose sum is σ = 187497235520. Its totient is φ = 36157290624.

The previous prime is 84521591039. The next prime is 84521591057. The reversal of 84521591056 is 65019512548.

It is a junction number, because it is equal to n+sod(n) for n = 84521590997 and 84521591015.

It is not an unprimeable number, because it can be changed into a prime (84521591057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 628551 + ... + 751078.

It is an arithmetic number, because the mean of its divisors is an integer number (4687430888).

Almost surely, 2^84521591056 is an apocalyptic number.

It is an amenable number.

84521591056 is an abundant number, since it is smaller than the sum of its proper divisors (102975644464).

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

84521591056 is a wasteful number, since it uses less digits than its factorization.

84521591056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380191 (or 1380185 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 46.

The spelling of 84521591056 in words is "eighty-four billion, five hundred twenty-one million, five hundred ninety-one thousand, fifty-six".