81550524469 has 8 divisors (see below), whose sum is σ = 83075401440. Its totient is φ = 80034697776.

The previous prime is 81550524467. The next prime is 81550524493. The reversal of 81550524469 is 96442505518.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81550524469 - 2¹ = 81550524467 is a prime.

It is a super-2 number, since 2×81550524469² (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 (81550524467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2244379 + ... + 2280424.

It is an arithmetic number, because the mean of its divisors is an integer number (10384425180).

Almost surely, 2^81550524469 is an apocalyptic number.

It is an amenable number.

81550524469 is a deficient number, since it is larger than the sum of its proper divisors (1524876971).

81550524469 is a wasteful number, since it uses less digits than its factorization.

81550524469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4525139.

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 81550524469 in words is "eighty-one billion, five hundred fifty million, five hundred twenty-four thousand, four hundred sixty-nine".