16001611989 has 8 divisors (see below), whose sum is σ = 23275072032. Its totient is φ = 9697946640.

The previous prime is 16001611987. The next prime is 16001612021. The reversal of 16001611989 is 98911610061.

It is a happy number.

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

It is not a de Polignac number, because 16001611989 - 2¹ = 16001611987 is a prime.

It is a super-2 number, since 2×16001611989² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16001611989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16001611987) 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 7 ways as a sum of consecutive naturals, for example, 242448634 + ... + 242448699.

It is an arithmetic number, because the mean of its divisors is an integer number (2909384004).

Almost surely, 2^16001611989 is an apocalyptic number.

It is an amenable number.

16001611989 is a deficient number, since it is larger than the sum of its proper divisors (7273460043).

16001611989 is a wasteful number, since it uses less digits than its factorization.

16001611989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484897347.

The product of its (nonzero) digits is 23328, while the sum is 42.

The spelling of 16001611989 in words is "sixteen billion, one million, six hundred eleven thousand, nine hundred eighty-nine".