161227777 has 2 divisors, whose sum is σ = 161227778. Its totient is φ = 161227776.

The previous prime is 161227751. The next prime is 161227789. The reversal of 161227777 is 777722161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120318961 + 40908816 = 10969^2 + 6396^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161227777 is a prime.

It is not a weakly prime, because it can be changed into another prime (161227747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80613888 + 80613889.

It is an arithmetic number, because the mean of its divisors is an integer number (80613889).

Almost surely, 2^161227777 is an apocalyptic number.

It is an amenable number.

161227777 is a deficient number, since it is larger than the sum of its proper divisors (1).

161227777 is an equidigital number, since it uses as much as digits as its factorization.

161227777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57624, while the sum is 40.

The square root of 161227777 is about 12697.5500392792. The cubic root of 161227777 is about 544.2686112634.

The spelling of 161227777 in words is "one hundred sixty-one million, two hundred twenty-seven thousand, seven hundred seventy-seven".