16422997561 has 2 divisors, whose sum is σ = 16422997562. Its totient is φ = 16422997560.

The previous prime is 16422997477. The next prime is 16422997573. The reversal of 16422997561 is 16579922461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8427240000 + 7995757561 = 91800^2 + 89419^2 .

It is a cyclic number.

It is not a de Polignac number, because 16422997561 - 2¹⁵ = 16422964793 is a prime.

It is a super-2 number, since 2×16422997561² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16422997499 and 16422997508.

It is not a weakly prime, because it can be changed into another prime (16422997361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8211498780 + 8211498781.

It is an arithmetic number, because the mean of its divisors is an integer number (8211498781).

Almost surely, 2^16422997561 is an apocalyptic number.

It is an amenable number.

16422997561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16422997561 is an equidigital number, since it uses as much as digits as its factorization.

16422997561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 52.

The spelling of 16422997561 in words is "sixteen billion, four hundred twenty-two million, nine hundred ninety-seven thousand, five hundred sixty-one".