84724255581 has 16 divisors (see below), whose sum is σ = 129176337024. Its totient is φ = 48386594304.

The previous prime is 84724255579. The next prime is 84724255591. The reversal of 84724255581 is 18555242748.

It is a happy number.

It is not a de Polignac number, because 84724255581 - 2¹ = 84724255579 is a prime.

It is a super-2 number, since 2×84724255581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84724255591) 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 15 ways as a sum of consecutive naturals, for example, 1097880 + ... + 1172513.

It is an arithmetic number, because the mean of its divisors is an integer number (8073521064).

Almost surely, 2^84724255581 is an apocalyptic number.

It is an amenable number.

84724255581 is a deficient number, since it is larger than the sum of its proper divisors (44452081443).

84724255581 is a wasteful number, since it uses less digits than its factorization.

84724255581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2272180.

The product of its digits is 3584000, while the sum is 51.

The spelling of 84724255581 in words is "eighty-four billion, seven hundred twenty-four million, two hundred fifty-five thousand, five hundred eighty-one".