161622470417 has 2 divisors, whose sum is σ = 161622470418. Its totient is φ = 161622470416.

The previous prime is 161622470389. The next prime is 161622470419. The reversal of 161622470417 is 714074226161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149895962896 + 11726507521 = 387164^2 + 108289^2 .

It is a cyclic number.

It is not a de Polignac number, because 161622470417 - 2³² = 157327503121 is a prime.

It is a super-2 number, since 2×161622470417² (a number of 23 digits) contains 22 as substring.

Together with 161622470419, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161622470419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80811235208 + 80811235209.

It is an arithmetic number, because the mean of its divisors is an integer number (80811235209).

Almost surely, 2^161622470417 is an apocalyptic number.

It is an amenable number.

161622470417 is a deficient number, since it is larger than the sum of its proper divisors (1).

161622470417 is an equidigital number, since it uses as much as digits as its factorization.

161622470417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 41.

Adding to 161622470417 its reverse (714074226161), we get a palindrome (875696696578).

The spelling of 161622470417 in words is "one hundred sixty-one billion, six hundred twenty-two million, four hundred seventy thousand, four hundred seventeen".