1664222177 has 2 divisors, whose sum is σ = 1664222178. Its totient is φ = 1664222176.

The previous prime is 1664222171. The next prime is 1664222233. The reversal of 1664222177 is 7712224661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1659421696 + 4800481 = 40736^2 + 2191^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664222177 - 2⁸ = 1664221921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1664222177.

It is not a weakly prime, because it can be changed into another prime (1664222171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832111088 + 832111089.

It is an arithmetic number, because the mean of its divisors is an integer number (832111089).

Almost surely, 2^1664222177 is an apocalyptic number.

It is an amenable number.

1664222177 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664222177 is an equidigital number, since it uses as much as digits as its factorization.

1664222177 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 38.

The square root of 1664222177 is about 40794.8792987551. The cubic root of 1664222177 is about 1185.0511652794.

The spelling of 1664222177 in words is "one billion, six hundred sixty-four million, two hundred twenty-two thousand, one hundred seventy-seven".