16687158281 has 2 divisors, whose sum is σ = 16687158282. Its totient is φ = 16687158280.

The previous prime is 16687158277. The next prime is 16687158343. The reversal of 16687158281 is 18285178661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14270452681 + 2416705600 = 119459^2 + 49160^2 .

It is a cyclic number.

It is not a de Polignac number, because 16687158281 - 2² = 16687158277 is a prime.

It is a super-2 number, since 2×16687158281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16687158211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8343579140 + 8343579141.

It is an arithmetic number, because the mean of its divisors is an integer number (8343579141).

Almost surely, 2^16687158281 is an apocalyptic number.

It is an amenable number.

16687158281 is a deficient number, since it is larger than the sum of its proper divisors (1).

16687158281 is an equidigital number, since it uses as much as digits as its factorization.

16687158281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1290240, while the sum is 53.

The spelling of 16687158281 in words is "sixteen billion, six hundred eighty-seven million, one hundred fifty-eight thousand, two hundred eighty-one".