16568138 has 4 divisors (see below), whose sum is σ = 24852210. Its totient is φ = 8284068.

The previous prime is 16568137. The next prime is 16568147. The reversal of 16568138 is 83186561.

It is a happy number.

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., 10029889 + 6538249 = 3167^2 + 2557^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16568137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4142033 + ... + 4142036.

Almost surely, 2^16568138 is an apocalyptic number.

16568138 is a deficient number, since it is larger than the sum of its proper divisors (8284072).

16568138 is an equidigital number, since it uses as much as digits as its factorization.

16568138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8284071.

The product of its digits is 34560, while the sum is 38.

The square root of 16568138 is about 4070.3977692604. The cubic root of 16568138 is about 254.9321259826.

The spelling of 16568138 in words is "sixteen million, five hundred sixty-eight thousand, one hundred thirty-eight".