16667636721733 has 2 divisors, whose sum is σ = 16667636721734. Its totient is φ = 16667636721732.

The previous prime is 16667636721689. The next prime is 16667636721773. The reversal of 16667636721733 is 33712763676661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9701088227649 + 6966548494084 = 3114657^2 + 2639422^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16667636721733 is a prime.

It is a super-2 number, since 2×16667636721733² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16667636721773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8333818360866 + 8333818360867.

It is an arithmetic number, because the mean of its divisors is an integer number (8333818360867).

Almost surely, 2^{16667636721733} is an apocalyptic number.

It is an amenable number.

16667636721733 is a deficient number, since it is larger than the sum of its proper divisors (1).

16667636721733 is an equidigital number, since it uses as much as digits as its factorization.

16667636721733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144027072, while the sum is 64.

The spelling of 16667636721733 in words is "sixteen trillion, six hundred sixty-seven billion, six hundred thirty-six million, seven hundred twenty-one thousand, seven hundred thirty-three".