989720944881 has 8 divisors (see below), whose sum is σ = 1351813973664. Its totient is φ = 643720939680.

The previous prime is 989720944787. The next prime is 989720944909. The reversal of 989720944881 is 188449027989.

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

It is not a de Polignac number, because 989720944881 - 2⁹ = 989720944369 is a prime.

It is a super-2 number, since 2×989720944881² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (989720244881) 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, 4023255751 + ... + 4023255996.

It is an arithmetic number, because the mean of its divisors is an integer number (168976746708).

Almost surely, 2^989720944881 is an apocalyptic number.

It is an amenable number.

989720944881 is a deficient number, since it is larger than the sum of its proper divisors (362093028783).

989720944881 is a wasteful number, since it uses less digits than its factorization.

989720944881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8046511791.

The product of its (nonzero) digits is 83607552, while the sum is 69.

The spelling of 989720944881 in words is "nine hundred eighty-nine billion, seven hundred twenty million, nine hundred forty-four thousand, eight hundred eighty-one".