81112583959 has 4 divisors (see below), whose sum is σ = 88486455240. Its totient is φ = 73738712680.

The previous prime is 81112583953. The next prime is 81112583999. The reversal of 81112583959 is 95938521118.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81112583959 - 2⁷ = 81112583831 is a prime.

It is a super-2 number, since 2×81112583959² (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 (81112583953) 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, 3686935624 + ... + 3686935645.

It is an arithmetic number, because the mean of its divisors is an integer number (22121613810).

Almost surely, 2^81112583959 is an apocalyptic number.

81112583959 is a deficient number, since it is larger than the sum of its proper divisors (7373871281).

81112583959 is a wasteful number, since it uses less digits than its factorization.

81112583959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7373871280.

The product of its digits is 777600, while the sum is 52.

The spelling of 81112583959 in words is "eighty-one billion, one hundred twelve million, five hundred eighty-three thousand, nine hundred fifty-nine".