16670681 has 4 divisors (see below), whose sum is σ = 16729872. Its totient is φ = 16611492.

The previous prime is 16670677. The next prime is 16670701. The reversal of 16670681 is 18607661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16670681 - 2² = 16670677 is a prime.

It is a super-2 number, since 2×16670681² = 555823210007522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16670611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29171 + ... + 29736.

It is an arithmetic number, because the mean of its divisors is an integer number (4182468).

Almost surely, 2^16670681 is an apocalyptic number.

It is an amenable number.

16670681 is a deficient number, since it is larger than the sum of its proper divisors (59191).

16670681 is an equidigital number, since it uses as much as digits as its factorization.

16670681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59190.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 16670681 is about 4082.9745284535. The cubic root of 16670681 is about 255.4569839615.

The spelling of 16670681 in words is "sixteen million, six hundred seventy thousand, six hundred eighty-one".