81588572873 has 4 divisors (see below), whose sum is σ = 82015738368. Its totient is φ = 81161407380.

The previous prime is 81588572867. The next prime is 81588572881. The reversal of 81588572873 is 37827588518.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37827588518 = 2 ⋅18913794259.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81588572873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81588572803) 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, 213582461 + ... + 213582842.

It is an arithmetic number, because the mean of its divisors is an integer number (20503934592).

Almost surely, 2^81588572873 is an apocalyptic number.

It is an amenable number.

81588572873 is a deficient number, since it is larger than the sum of its proper divisors (427165495).

81588572873 is a wasteful number, since it uses less digits than its factorization.

81588572873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427165494.

The product of its digits is 30105600, while the sum is 62.

The spelling of 81588572873 in words is "eighty-one billion, five hundred eighty-eight million, five hundred seventy-two thousand, eight hundred seventy-three".