81588575139 has 8 divisors (see below), whose sum is σ = 108818977872. Its totient is φ = 54375277920.

The previous prime is 81588575137. The next prime is 81588575141. The reversal of 81588575139 is 93157588518.

It is an interprime number because it is at equal distance from previous prime (81588575137) and next prime (81588575141).

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

It is not a de Polignac number, because 81588575139 - 2¹ = 81588575137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81588575137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4265244 + ... + 4284329.

It is an arithmetic number, because the mean of its divisors is an integer number (13602372234).

Almost surely, 2^81588575139 is an apocalyptic number.

81588575139 is a deficient number, since it is larger than the sum of its proper divisors (27230402733).

81588575139 is a wasteful number, since it uses less digits than its factorization.

81588575139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8552757.

The product of its digits is 12096000, while the sum is 60.

The spelling of 81588575139 in words is "eighty-one billion, five hundred eighty-eight million, five hundred seventy-five thousand, one hundred thirty-nine".