156161222209 has 2 divisors, whose sum is σ = 156161222210. Its totient is φ = 156161222208.

The previous prime is 156161222153. The next prime is 156161222219. The reversal of 156161222209 is 902222161651.

156161222209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120706215184 + 35455007025 = 347428^2 + 188295^2 .

It is a cyclic number.

It is not a de Polignac number, because 156161222209 - 2¹³ = 156161214017 is a prime.

It is not a weakly prime, because it can be changed into another prime (156161222219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78080611104 + 78080611105.

It is an arithmetic number, because the mean of its divisors is an integer number (78080611105).

Almost surely, 2^156161222209 is an apocalyptic number.

It is an amenable number.

156161222209 is a deficient number, since it is larger than the sum of its proper divisors (1).

156161222209 is an equidigital number, since it uses as much as digits as its factorization.

156161222209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 156161222209 in words is "one hundred fifty-six billion, one hundred sixty-one million, two hundred twenty-two thousand, two hundred nine".