16681008733 has 2 divisors, whose sum is σ = 16681008734. Its totient is φ = 16681008732.

The previous prime is 16681008709. The next prime is 16681008739. The reversal of 16681008733 is 33780018661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12321444004 + 4359564729 = 111002^2 + 66027^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16681008733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16681008733.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16681008739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8340504366 + 8340504367.

It is an arithmetic number, because the mean of its divisors is an integer number (8340504367).

Almost surely, 2^16681008733 is an apocalyptic number.

It is an amenable number.

16681008733 is a deficient number, since it is larger than the sum of its proper divisors (1).

16681008733 is an equidigital number, since it uses as much as digits as its factorization.

16681008733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 16681008733 in words is "sixteen billion, six hundred eighty-one million, eight thousand, seven hundred thirty-three".