16423156181 has 2 divisors, whose sum is σ = 16423156182. Its totient is φ = 16423156180.

The previous prime is 16423156159. The next prime is 16423156213. The reversal of 16423156181 is 18165132461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13282562500 + 3140593681 = 115250^2 + 56041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16423156181 is a prime.

It is a super-2 number, since 2×16423156181² (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 (16423156121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8211578090 + 8211578091.

It is an arithmetic number, because the mean of its divisors is an integer number (8211578091).

Almost surely, 2^16423156181 is an apocalyptic number.

It is an amenable number.

16423156181 is a deficient number, since it is larger than the sum of its proper divisors (1).

16423156181 is an equidigital number, since it uses as much as digits as its factorization.

16423156181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 38.

The spelling of 16423156181 in words is "sixteen billion, four hundred twenty-three million, one hundred fifty-six thousand, one hundred eighty-one".