16681845 has 16 divisors (see below), whose sum is σ = 28261440. Its totient is φ = 8373504.

The previous prime is 16681843. The next prime is 16681849. The reversal of 16681845 is 54818661.

It is not a de Polignac number, because 16681845 - 2¹ = 16681843 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16681843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32455 + ... + 32964.

It is an arithmetic number, because the mean of its divisors is an integer number (1766340).

Almost surely, 2^16681845 is an apocalyptic number.

16681845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16681845 is a deficient number, since it is larger than the sum of its proper divisors (11579595).

16681845 is a wasteful number, since it uses less digits than its factorization.

16681845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65444.

The product of its digits is 46080, while the sum is 39.

The square root of 16681845 is about 4084.3414401835. The cubic root of 16681845 is about 255.5139959373.

The spelling of 16681845 in words is "sixteen million, six hundred eighty-one thousand, eight hundred forty-five".