16207431604181 has 2 divisors, whose sum is σ = 16207431604182. Its totient is φ = 16207431604180.

The previous prime is 16207431604163. The next prime is 16207431604183. The reversal of 16207431604181 is 18140613470261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11348537200081 + 4858894404100 = 3368759^2 + 2204290^2 .

It is a cyclic number.

It is not a de Polignac number, because 16207431604181 - 2²⁶ = 16207364495317 is a prime.

It is a super-2 number, since 2×16207431604181² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 16207431604183, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16207431604183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8103715802090 + 8103715802091.

It is an arithmetic number, because the mean of its divisors is an integer number (8103715802091).

Almost surely, 2^{16207431604181} is an apocalyptic number.

It is an amenable number.

16207431604181 is a deficient number, since it is larger than the sum of its proper divisors (1).

16207431604181 is an equidigital number, since it uses as much as digits as its factorization.

16207431604181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 16207431604181 in words is "sixteen trillion, two hundred seven billion, four hundred thirty-one million, six hundred four thousand, one hundred eighty-one".