161223622117 has 2 divisors, whose sum is σ = 161223622118. Its totient is φ = 161223622116.

The previous prime is 161223622103. The next prime is 161223622129. The reversal of 161223622117 is 711226322161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161126776836 + 96845281 = 401406^2 + 9841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161223622117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161223623117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80611811058 + 80611811059.

It is an arithmetic number, because the mean of its divisors is an integer number (80611811059).

Almost surely, 2^161223622117 is an apocalyptic number.

It is an amenable number.

161223622117 is a deficient number, since it is larger than the sum of its proper divisors (1).

161223622117 is an equidigital number, since it uses as much as digits as its factorization.

161223622117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

Adding to 161223622117 its reverse (711226322161), we get a palindrome (872449944278).

The spelling of 161223622117 in words is "one hundred sixty-one billion, two hundred twenty-three million, six hundred twenty-two thousand, one hundred seventeen".