16681954 has 4 divisors (see below), whose sum is σ = 25022934. Its totient is φ = 8340976.

The previous prime is 16681949. The next prime is 16681991. The reversal of 16681954 is 45918661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16621929 + 60025 = 4077^2 + 245^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4170487 + ... + 4170490.

Almost surely, 2^16681954 is an apocalyptic number.

16681954 is a deficient number, since it is larger than the sum of its proper divisors (8340980).

16681954 is an equidigital number, since it uses as much as digits as its factorization.

16681954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8340979.

The product of its digits is 51840, while the sum is 40.

The square root of 16681954 is about 4084.3547838061. The cubic root of 16681954 is about 255.5145524497.

The spelling of 16681954 in words is "sixteen million, six hundred eighty-one thousand, nine hundred fifty-four".