16656361 has 2 divisors, whose sum is σ = 16656362. Its totient is φ = 16656360.

The previous prime is 16656359. The next prime is 16656371. The reversal of 16656361 is 16365661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8590761 + 8065600 = 2931^2 + 2840^2 .

It is a cyclic number.

It is not a de Polignac number, because 16656361 - 2¹ = 16656359 is a prime.

Together with 16656359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16656371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8328180 + 8328181.

It is an arithmetic number, because the mean of its divisors is an integer number (8328181).

Almost surely, 2^16656361 is an apocalyptic number.

It is an amenable number.

16656361 is a deficient number, since it is larger than the sum of its proper divisors (1).

16656361 is an equidigital number, since it uses as much as digits as its factorization.

16656361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 16656361 is about 4081.2205282244. The cubic root of 16656361 is about 255.3838177453.

The spelling of 16656361 in words is "sixteen million, six hundred fifty-six thousand, three hundred sixty-one".