16668398747 has 96 divisors (see below), whose sum is σ = 24186677760. Its totient is φ = 11267182080.

The previous prime is 16668398699. The next prime is 16668398753. The reversal of 16668398747 is 74789386661.

16668398747 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16668398747 - 2⁶ = 16668398683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16668398767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9507623 + ... + 9509375.

It is an arithmetic number, because the mean of its divisors is an integer number (251944560).

Almost surely, 2^16668398747 is an apocalyptic number.

16668398747 is a deficient number, since it is larger than the sum of its proper divisors (7518279013).

16668398747 is a wasteful number, since it uses less digits than its factorization.

16668398747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1873 (or 1866 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 65.

The spelling of 16668398747 in words is "sixteen billion, six hundred sixty-eight million, three hundred ninety-eight thousand, seven hundred forty-seven".