89918066581 has 8 divisors (see below), whose sum is σ = 102765997760. Its totient is φ = 77070758688.

The previous prime is 89918066573. The next prime is 89918066627. The reversal of 89918066581 is 18566081998.

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

It is not a de Polignac number, because 89918066581 - 2³ = 89918066573 is a prime.

It is a super-2 number, since 2×89918066581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89918066551) 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, 210850 + ... + 473596.

It is an arithmetic number, because the mean of its divisors is an integer number (12845749720).

Almost surely, 2^89918066581 is an apocalyptic number.

It is an amenable number.

89918066581 is a deficient number, since it is larger than the sum of its proper divisors (12847931179).

89918066581 is a wasteful number, since it uses less digits than its factorization.

89918066581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311643.

The product of its (nonzero) digits is 7464960, while the sum is 61.

The spelling of 89918066581 in words is "eighty-nine billion, nine hundred eighteen million, sixty-six thousand, five hundred eighty-one".