16656139 has 2 divisors, whose sum is σ = 16656140. Its totient is φ = 16656138.

The previous prime is 16656119. The next prime is 16656169. The reversal of 16656139 is 93165661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16656139 - 2¹⁹ = 16131851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16656098 and 16656107.

It is not a weakly prime, because it can be changed into another prime (16656119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8328069 + 8328070.

It is an arithmetic number, because the mean of its divisors is an integer number (8328070).

Almost surely, 2^16656139 is an apocalyptic number.

16656139 is a deficient number, since it is larger than the sum of its proper divisors (1).

16656139 is an equidigital number, since it uses as much as digits as its factorization.

16656139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 37.

The square root of 16656139 is about 4081.1933303876. The cubic root of 16656139 is about 255.3826831346.

The spelling of 16656139 in words is "sixteen million, six hundred fifty-six thousand, one hundred thirty-nine".