81589140059 has 16 divisors (see below), whose sum is σ = 95245464000. Its totient is φ = 69861681792.

The previous prime is 81589140037. The next prime is 81589140071. The reversal of 81589140059 is 95004198518.

It is not a de Polignac number, because 81589140059 - 2³² = 77294172763 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81589139989 and 81589140016.

It is not an unprimeable number, because it can be changed into a prime (81589146059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213377 + ... + 456845.

It is an arithmetic number, because the mean of its divisors is an integer number (5952841500).

Almost surely, 2^81589140059 is an apocalyptic number.

81589140059 is a deficient number, since it is larger than the sum of its proper divisors (13656323941).

81589140059 is an equidigital number, since it uses as much as digits as its factorization.

81589140059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244467 (or 244453 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 50.

The spelling of 81589140059 in words is "eighty-one billion, five hundred eighty-nine million, one hundred forty thousand, fifty-nine".