84145255521 has 16 divisors (see below), whose sum is σ = 125045582400. Its totient is φ = 50018231808.

The previous prime is 84145255477. The next prime is 84145255553. The reversal of 84145255521 is 12555254148.

It is not a de Polignac number, because 84145255521 - 2⁷ = 84145255393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84145255121) 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, 43417636 + ... + 43419573.

It is an arithmetic number, because the mean of its divisors is an integer number (7815348900).

Almost surely, 2^84145255521 is an apocalyptic number.

It is an amenable number.

84145255521 is a deficient number, since it is larger than the sum of its proper divisors (40900326879).

84145255521 is a wasteful number, since it uses less digits than its factorization.

84145255521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86837248.

The product of its digits is 320000, while the sum is 42.

The spelling of 84145255521 in words is "eighty-four billion, one hundred forty-five million, two hundred fifty-five thousand, five hundred twenty-one".