16778441 has 2 divisors, whose sum is σ = 16778442. Its totient is φ = 16778440.

The previous prime is 16778429. The next prime is 16778449. The reversal of 16778441 is 14487761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16777216 + 1225 = 4096^2 + 35^2 .

It is an emirp because it is prime and its reverse (14487761) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16778441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16778395 and 16778404.

It is not a weakly prime, because it can be changed into another prime (16778449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8389220 + 8389221.

It is an arithmetic number, because the mean of its divisors is an integer number (8389221).

Almost surely, 2^16778441 is an apocalyptic number.

It is an amenable number.

16778441 is a deficient number, since it is larger than the sum of its proper divisors (1).

16778441 is an equidigital number, since it uses as much as digits as its factorization.

16778441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 38.

The square root of 16778441 is about 4096.1495334033. The cubic root of 16778441 is about 256.0062305206.

The spelling of 16778441 in words is "sixteen million, seven hundred seventy-eight thousand, four hundred forty-one".