81493083259 has 8 divisors (see below), whose sum is σ = 97184298240. Its totient is φ = 66814204776.

The previous prime is 81493083149. The next prime is 81493083271. The reversal of 81493083259 is 95238039418.

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

It is a cyclic number.

It is not a de Polignac number, because 81493083259 - 2²⁵ = 81459528827 is a prime.

It is a super-2 number, since 2×81493083259² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81493084259) 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, 253083949 + ... + 253084270.

It is an arithmetic number, because the mean of its divisors is an integer number (12148037280).

Almost surely, 2^81493083259 is an apocalyptic number.

81493083259 is a deficient number, since it is larger than the sum of its proper divisors (15691214981).

81493083259 is a wasteful number, since it uses less digits than its factorization.

81493083259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506168249.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 81493083259 in words is "eighty-one billion, four hundred ninety-three million, eighty-three thousand, two hundred fifty-nine".