16681907 has 6 divisors (see below), whose sum is σ = 18336444. Its totient is φ = 15165260.

The previous prime is 16681901. The next prime is 16681919. The reversal of 16681907 is 70918661.

It is not a de Polignac number, because 16681907 - 2⁶ = 16681843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16681901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68813 + ... + 69054.

It is an arithmetic number, because the mean of its divisors is an integer number (3056074).

Almost surely, 2^16681907 is an apocalyptic number.

16681907 is a deficient number, since it is larger than the sum of its proper divisors (1654537).

16681907 is a wasteful number, since it uses less digits than its factorization.

16681907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137889 (or 137878 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 16681907 is about 4084.3490301393. The cubic root of 16681907 is about 255.5143124859.

The spelling of 16681907 in words is "sixteen million, six hundred eighty-one thousand, nine hundred seven".