16670881 has 2 divisors, whose sum is σ = 16670882. Its totient is φ = 16670880.

The previous prime is 16670879. The next prime is 16670939. The reversal of 16670881 is 18807661.

16670881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16321600 + 349281 = 4040^2 + 591^2 .

It is a cyclic number.

It is not a de Polignac number, because 16670881 - 2¹ = 16670879 is a prime.

It is a super-2 number, since 2×16670881² = 555836546632322, which contains 22 as substring.

Together with 16670879, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 16670881.

It is not a weakly prime, because it can be changed into another prime (16670851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8335440 + 8335441.

It is an arithmetic number, because the mean of its divisors is an integer number (8335441).

Almost surely, 2^16670881 is an apocalyptic number.

It is an amenable number.

16670881 is a deficient number, since it is larger than the sum of its proper divisors (1).

16670881 is an equidigital number, since it uses as much as digits as its factorization.

16670881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 16670881 is about 4082.9990203281. Note that the first 3 decimals coincide. The cubic root of 16670881 is about 255.4580055393.

The spelling of 16670881 in words is "sixteen million, six hundred seventy thousand, eight hundred eighty-one".