987544222445789 has 4 divisors (see below), whose sum is σ = 997725090718524. Its totient is φ = 977363354173056.

The previous prime is 987544222445773. The next prime is 987544222445831.

987544222445789 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 381004360764889 + 606539861680900 = 19519333^2 + 24628030^2 .

It is a cyclic number.

It is not a de Polignac number, because 987544222445789 - 2⁴ = 987544222445773 is a prime.

It is a super-2 number, since 2×987544222445789² (a number of 31 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 (987544222445719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5090434136222 + ... + 5090434136415.

It is an arithmetic number, because the mean of its divisors is an integer number (249431272679631).

Almost surely, 2^{987544222445789} is an apocalyptic number.

It is an amenable number.

987544222445789 is a deficient number, since it is larger than the sum of its proper divisors (10180868272735).

987544222445789 is a wasteful number, since it uses less digits than its factorization.

987544222445789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10180868272734.

The product of its digits is 13005619200, while the sum is 80.

The spelling of 987544222445789 in words is "nine hundred eighty-seven trillion, five hundred forty-four billion, two hundred twenty-two million, four hundred forty-five thousand, seven hundred eighty-nine".