16670033518681 has 2 divisors, whose sum is σ = 16670033518682. Its totient is φ = 16670033518680.

The previous prime is 16670033518679. The next prime is 16670033518693. The reversal of 16670033518681 is 18681533007661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13276848475081 + 3393185043600 = 3643741^2 + 1842060^2 .

It is a cyclic number.

It is not a de Polignac number, because 16670033518681 - 2¹ = 16670033518679 is a prime.

It is a super-2 number, since 2×16670033518681² (a number of 27 digits) contains 22 as substring.

Together with 16670033518679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16670033518651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8335016759340 + 8335016759341.

It is an arithmetic number, because the mean of its divisors is an integer number (8335016759341).

Almost surely, 2^{16670033518681} is an apocalyptic number.

It is an amenable number.

16670033518681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16670033518681 is an equidigital number, since it uses as much as digits as its factorization.

16670033518681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 16670033518681 in words is "sixteen trillion, six hundred seventy billion, thirty-three million, five hundred eighteen thousand, six hundred eighty-one".