84744069581 has 4 divisors (see below), whose sum is σ = 84971265852. Its totient is φ = 84516873312.

The previous prime is 84744069559. The next prime is 84744069589. The reversal of 84744069581 is 18596044748.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25456202500 + 59287867081 = 159550^2 + 243491^2 .

It is a cyclic number.

It is not a de Polignac number, because 84744069581 - 2³⁰ = 83670327757 is a prime.

It is a super-2 number, since 2×84744069581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84744069589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113597576 + ... + 113598321.

It is an arithmetic number, because the mean of its divisors is an integer number (21242816463).

Almost surely, 2^84744069581 is an apocalyptic number.

It is an amenable number.

84744069581 is a deficient number, since it is larger than the sum of its proper divisors (227196271).

84744069581 is a wasteful number, since it uses less digits than its factorization.

84744069581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227196270.

The product of its (nonzero) digits is 7741440, while the sum is 56.

The spelling of 84744069581 in words is "eighty-four billion, seven hundred forty-four million, sixty-nine thousand, five hundred eighty-one".