16420981768 has 16 divisors (see below), whose sum is σ = 32600478780. Its totient is φ = 7727520768.

The previous prime is 16420981741. The next prime is 16420981769. The reversal of 16420981768 is 86718902461.

It can be written as a sum of positive squares in 2 ways, for example, as 16343576964 + 77404804 = 127842^2 + 8798^2 .

It is not an unprimeable number, because it can be changed into a prime (16420981769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60371121 + ... + 60371392.

Almost surely, 2^16420981768 is an apocalyptic number.

It is an amenable number.

16420981768 is a deficient number, since it is larger than the sum of its proper divisors (16179497012).

16420981768 is a wasteful number, since it uses less digits than its factorization.

16420981768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120742536 (or 120742532 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 16420981768 in words is "sixteen billion, four hundred twenty million, nine hundred eighty-one thousand, seven hundred sixty-eight".