16681670 has 64 divisors (see below), whose sum is σ = 33747840. Its totient is φ = 5913600.

The previous prime is 16681667. The next prime is 16681673. The reversal of 16681670 is 7618661.

It is an interprime number because it is at equal distance from previous prime (16681667) and next prime (16681673).

It is a super-2 number, since 2×16681670² = 556556227977800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 16681670.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16681673) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 273440 + ... + 273500.

It is an arithmetic number, because the mean of its divisors is an integer number (527310).

Almost surely, 2^16681670 is an apocalyptic number.

16681670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16681670 is the 3335-th pentagonal number.

16681670 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

16681670 is a wasteful number, since it uses less digits than its factorization.

16681670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161.

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

The square root of 16681670 is about 4084.3200168449. The cubic root of 16681670 is about 255.5131024488.

The spelling of 16681670 in words is "sixteen million, six hundred eighty-one thousand, six hundred seventy".