161095503209 has 2 divisors, whose sum is σ = 161095503210. Its totient is φ = 161095503208.

The previous prime is 161095503169. The next prime is 161095503223. The reversal of 161095503209 is 902305590161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158846088025 + 2249415184 = 398555^2 + 47428^2 .

It is a cyclic number.

It is not a de Polignac number, because 161095503209 - 2¹² = 161095499113 is a prime.

It is a super-2 number, since 2×161095503209² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161095503109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80547751604 + 80547751605.

It is an arithmetic number, because the mean of its divisors is an integer number (80547751605).

Almost surely, 2^161095503209 is an apocalyptic number.

It is an amenable number.

161095503209 is a deficient number, since it is larger than the sum of its proper divisors (1).

161095503209 is an equidigital number, since it uses as much as digits as its factorization.

161095503209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72900, while the sum is 41.

The spelling of 161095503209 in words is "one hundred sixty-one billion, ninety-five million, five hundred three thousand, two hundred nine".