1664677171 has 2 divisors, whose sum is σ = 1664677172. Its totient is φ = 1664677170.

The previous prime is 1664677139. The next prime is 1664677199. The reversal of 1664677171 is 1717764661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1664677171 - 2⁵ = 1664677139 is a prime.

It is not a weakly prime, because it can be changed into another prime (1664677871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832338585 + 832338586.

It is an arithmetic number, because the mean of its divisors is an integer number (832338586).

Almost surely, 2^1664677171 is an apocalyptic number.

1664677171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664677171 is an equidigital number, since it uses as much as digits as its factorization.

1664677171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 296352, while the sum is 46.

The square root of 1664677171 is about 40800.4555244179. The cubic root of 1664677171 is about 1185.1591520708.

The spelling of 1664677171 in words is "one billion, six hundred sixty-four million, six hundred seventy-seven thousand, one hundred seventy-one".