16778023 has 2 divisors, whose sum is σ = 16778024. Its totient is φ = 16778022.

The previous prime is 16778009. The next prime is 16778071. The reversal of 16778023 is 32087761.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16778023 - 2⁵ = 16777991 is a prime.

It is equal to p_1077919 and since 16778023 and 1077919 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16778023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16778123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8389011 + 8389012.

It is an arithmetic number, because the mean of its divisors is an integer number (8389012).

Almost surely, 2^16778023 is an apocalyptic number.

16778023 is a deficient number, since it is larger than the sum of its proper divisors (1).

16778023 is an equidigital number, since it uses as much as digits as its factorization.

16778023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 16778023 is about 4096.0985095576. The cubic root of 16778023 is about 256.0041045484.

The spelling of 16778023 in words is "sixteen million, seven hundred seventy-eight thousand, twenty-three".