89645555521 has 8 divisors (see below), whose sum is σ = 89857044360. Its totient is φ = 89434134528.

The previous prime is 89645555491. The next prime is 89645555533. The reversal of 89645555521 is 12555554698.

It can be written as a sum of positive squares in 4 ways, for example, as 23062978225 + 66582577296 = 151865^2 + 258036^2 .

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 89645555521 - 2⁷ = 89645555393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89645555551) 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, 3449745 + ... + 3475633.

It is an arithmetic number, because the mean of its divisors is an integer number (11232130545).

Almost surely, 2^89645555521 is an apocalyptic number.

It is an amenable number.

89645555521 is a deficient number, since it is larger than the sum of its proper divisors (211488839).

89645555521 is a wasteful number, since it uses less digits than its factorization.

89645555521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33923.

The product of its digits is 10800000, while the sum is 55.

The spelling of 89645555521 in words is "eighty-nine billion, six hundred forty-five million, five hundred fifty-five thousand, five hundred twenty-one".