1227622556161 has 2 divisors, whose sum is σ = 1227622556162. Its totient is φ = 1227622556160.

The previous prime is 1227622556141. The next prime is 1227622556183. The reversal of 1227622556161 is 1616552267221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 932105287936 + 295517268225 = 965456^2 + 543615^2 .

It is an emirp because it is prime and its reverse (1616552267221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1227622556161 - 2²⁵ = 1227589001729 is a prime.

It is not a weakly prime, because it can be changed into another prime (1227622556131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613811278080 + 613811278081.

It is an arithmetic number, because the mean of its divisors is an integer number (613811278081).

Almost surely, 2^{1227622556161} is an apocalyptic number.

It is an amenable number.

1227622556161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1227622556161 is an equidigital number, since it uses as much as digits as its factorization.

1227622556161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 46.

The spelling of 1227622556161 in words is "one trillion, two hundred twenty-seven billion, six hundred twenty-two million, five hundred fifty-six thousand, one hundred sixty-one".