16128388787972 has 72 divisors (see below), whose sum is σ = 30970374492960. Its totient is φ = 7342180433280.

The previous prime is 16128388787971. The next prime is 16128388788053. The reversal of 16128388787972 is 27978788382161.

It is a junction number, because it is equal to n+sod(n) for n = 16128388787893 and 16128388787902.

It is not an unprimeable number, because it can be changed into a prime (16128388787971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1933679 + ... + 5999657.

It is an arithmetic number, because the mean of its divisors is an integer number (430144090180).

Almost surely, 2^{16128388787972} is an apocalyptic number.

It is an amenable number.

16128388787972 is a deficient number, since it is larger than the sum of its proper divisors (14841985704988).

16128388787972 is a wasteful number, since it uses less digits than its factorization.

16128388787972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4066129 (or 4066108 counting only the distinct ones).

The product of its digits is 910393344, while the sum is 77.

The spelling of 16128388787972 in words is "sixteen trillion, one hundred twenty-eight billion, three hundred eighty-eight million, seven hundred eighty-seven thousand, nine hundred seventy-two".