16880681 has 2 divisors, whose sum is σ = 16880682. Its totient is φ = 16880680.

The previous prime is 16880629. The next prime is 16880687. The reversal of 16880681 is 18608861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16736281 + 144400 = 4091^2 + 380^2 .

It is an emirp because it is prime and its reverse (18608861) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 18908891 and 19880981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16880681 is a prime.

It is a super-2 number, since 2×16880681² = 569914782047522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (16880687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8440340 + 8440341.

It is an arithmetic number, because the mean of its divisors is an integer number (8440341).

Almost surely, 2^16880681 is an apocalyptic number.

It is an amenable number.

16880681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16880681 is an equidigital number, since it uses as much as digits as its factorization.

16880681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 16880681 is about 4108.6105924023. The cubic root of 16880681 is about 256.5251721006.

The spelling of 16880681 in words is "sixteen million, eight hundred eighty thousand, six hundred eighty-one".