16556427 has 16 divisors (see below), whose sum is σ = 25192480. Its totient is φ = 10738656.

The previous prime is 16556381. The next prime is 16556443. The reversal of 16556427 is 72465561.

It is a happy number.

16556427 is a `hidden beast` number, since 1 + 6 + 5 + 5 + 642 + 7 = 666.

It is not a de Polignac number, because 16556427 - 2⁶ = 16556363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16556391 and 16556400.

It is not an unprimeable number, because it can be changed into a prime (16556227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7288 + ... + 9285.

It is an arithmetic number, because the mean of its divisors is an integer number (1574530).

Almost surely, 2^16556427 is an apocalyptic number.

16556427 is a deficient number, since it is larger than the sum of its proper divisors (8636053).

16556427 is a wasteful number, since it uses less digits than its factorization.

16556427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16619 (or 16613 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 16556427 is about 4068.9589577679. The cubic root of 16556427 is about 254.8720465331.

The spelling of 16556427 in words is "sixteen million, five hundred fifty-six thousand, four hundred twenty-seven".