81589559601 has 24 divisors (see below), whose sum is σ = 119593970272. Its totient is φ = 49440283200.

The previous prime is 81589559599. The next prime is 81589559627. The reversal of 81589559601 is 10695598518.

It is not a de Polignac number, because 81589559601 - 2¹ = 81589559599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81589559651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2893965 + ... + 2922021.

Almost surely, 2^81589559601 is an apocalyptic number.

It is an amenable number.

81589559601 is a deficient number, since it is larger than the sum of its proper divisors (38004410671).

81589559601 is a wasteful number, since it uses less digits than its factorization.

81589559601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36093 (or 36082 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 57.

The spelling of 81589559601 in words is "eighty-one billion, five hundred eighty-nine million, five hundred fifty-nine thousand, six hundred one".