16778410169 has 2 divisors, whose sum is σ = 16778410170. Its totient is φ = 16778410168.

The previous prime is 16778410163. The next prime is 16778410189. The reversal of 16778410169 is 96101487761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10917742144 + 5860668025 = 104488^2 + 76555^2 .

It is an emirp because it is prime and its reverse (96101487761) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16778410169 is a prime.

It is a super-2 number, since 2×16778410169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16778410163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8389205084 + 8389205085.

It is an arithmetic number, because the mean of its divisors is an integer number (8389205085).

Almost surely, 2^16778410169 is an apocalyptic number.

It is an amenable number.

16778410169 is a deficient number, since it is larger than the sum of its proper divisors (1).

16778410169 is an equidigital number, since it uses as much as digits as its factorization.

16778410169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 50.

The spelling of 16778410169 in words is "sixteen billion, seven hundred seventy-eight million, four hundred ten thousand, one hundred sixty-nine".