16778959 has 2 divisors, whose sum is σ = 16778960. Its totient is φ = 16778958.

The previous prime is 16778947. The next prime is 16778981. The reversal of 16778959 is 95987761.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16778959 - 2²³ = 8390351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16778929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8389479 + 8389480.

It is an arithmetic number, because the mean of its divisors is an integer number (8389480).

Almost surely, 2^16778959 is an apocalyptic number.

16778959 is a deficient number, since it is larger than the sum of its proper divisors (1).

16778959 is an equidigital number, since it uses as much as digits as its factorization.

16778959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 52.

The square root of 16778959 is about 4096.2127630288. The cubic root of 16778959 is about 256.0088650495.

The spelling of 16778959 in words is "sixteen million, seven hundred seventy-eight thousand, nine hundred fifty-nine".