81589764129 has 8 divisors (see below), whose sum is σ = 108796534560. Its totient is φ = 54388084896.

The previous prime is 81589764121. The next prime is 81589764229. The reversal of 81589764129 is 92146798518.

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

It is not a de Polignac number, because 81589764129 - 2³ = 81589764121 is a prime.

It is a super-2 number, since 2×81589764129² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81589764121) 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, 1235247 + ... + 1299620.

It is an arithmetic number, because the mean of its divisors is an integer number (13599566820).

Almost surely, 2^81589764129 is an apocalyptic number.

It is an amenable number.

81589764129 is a deficient number, since it is larger than the sum of its proper divisors (27206770431).

81589764129 is a wasteful number, since it uses less digits than its factorization.

81589764129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545599.

The product of its digits is 8709120, while the sum is 60.

The spelling of 81589764129 in words is "eighty-one billion, five hundred eighty-nine million, seven hundred sixty-four thousand, one hundred twenty-nine".