16681693 has 8 divisors (see below), whose sum is σ = 19893888. Its totient is φ = 13676784.

The previous prime is 16681681. The next prime is 16681703. The reversal of 16681693 is 39618661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16681693 - 2⁵ = 16681661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16681633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51646 + ... + 51967.

It is an arithmetic number, because the mean of its divisors is an integer number (2486736).

Almost surely, 2^16681693 is an apocalyptic number.

It is an amenable number.

16681693 is a deficient number, since it is larger than the sum of its proper divisors (3212195).

16681693 is a wasteful number, since it uses less digits than its factorization.

16681693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103643.

The product of its digits is 46656, while the sum is 40.

The square root of 16681693 is about 4084.3228324901. The cubic root of 16681693 is about 255.5132198791.

The spelling of 16681693 in words is "sixteen million, six hundred eighty-one thousand, six hundred ninety-three".