81530824567 has 8 divisors (see below), whose sum is σ = 81597035520. Its totient is φ = 81464643960.

The previous prime is 81530824559. The next prime is 81530824579. The reversal of 81530824567 is 76542803518.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81530824567 - 2³ = 81530824559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81530824567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81530828567) 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, 9543784 + ... + 9552322.

It is an arithmetic number, because the mean of its divisors is an integer number (10199629440).

Almost surely, 2^81530824567 is an apocalyptic number.

81530824567 is a deficient number, since it is larger than the sum of its proper divisors (66210953).

81530824567 is a wasteful number, since it uses less digits than its factorization.

81530824567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15173.

The product of its (nonzero) digits is 1612800, while the sum is 49.

The spelling of 81530824567 in words is "eighty-one billion, five hundred thirty million, eight hundred twenty-four thousand, five hundred sixty-seven".