16723788181 has 2 divisors, whose sum is σ = 16723788182. Its totient is φ = 16723788180.

The previous prime is 16723788173. The next prime is 16723788217. The reversal of 16723788181 is 18188732761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8642677156 + 8081111025 = 92966^2 + 89895^2 .

It is a cyclic number.

It is not a de Polignac number, because 16723788181 - 2³ = 16723788173 is a prime.

It is a super-2 number, since 2×16723788181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16723728181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8361894090 + 8361894091.

It is an arithmetic number, because the mean of its divisors is an integer number (8361894091).

Almost surely, 2^16723788181 is an apocalyptic number.

It is an amenable number.

16723788181 is a deficient number, since it is larger than the sum of its proper divisors (1).

16723788181 is an equidigital number, since it uses as much as digits as its factorization.

16723788181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 52.

The spelling of 16723788181 in words is "sixteen billion, seven hundred twenty-three million, seven hundred eighty-eight thousand, one hundred eighty-one".