81589141618 has 8 divisors (see below), whose sum is σ = 122488228080. Its totient is φ = 40759732260.

The previous prime is 81589141597. The next prime is 81589141619. The reversal of 81589141618 is 81614198518.

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

It is not an unprimeable number, because it can be changed into a prime (81589141619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17416348 + ... + 17421031.

It is an arithmetic number, because the mean of its divisors is an integer number (15311028510).

Almost surely, 2^81589141618 is an apocalyptic number.

81589141618 is a deficient number, since it is larger than the sum of its proper divisors (40899086462).

81589141618 is a wasteful number, since it uses less digits than its factorization.

81589141618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34838552.

The product of its digits is 552960, while the sum is 52.

The spelling of 81589141618 in words is "eighty-one billion, five hundred eighty-nine million, one hundred forty-one thousand, six hundred eighteen".