171664769 has 2 divisors, whose sum is σ = 171664770. Its totient is φ = 171664768.

The previous prime is 171664733. The next prime is 171664777. The reversal of 171664769 is 967466171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97911025 + 73753744 = 9895^2 + 8588^2 .

It is a cyclic number.

It is not a de Polignac number, because 171664769 - 2²⁴ = 154887553 is a prime.

It is a super-2 number, since 2×171664769² = 58937585831646722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (171664799) 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, 85832384 + 85832385.

It is an arithmetic number, because the mean of its divisors is an integer number (85832385).

Almost surely, 2^171664769 is an apocalyptic number.

It is an amenable number.

171664769 is a deficient number, since it is larger than the sum of its proper divisors (1).

171664769 is an equidigital number, since it uses as much as digits as its factorization.

171664769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 47.

The square root of 171664769 is about 13102.0902530856. The cubic root of 171664769 is about 555.7682394580.

The spelling of 171664769 in words is "one hundred seventy-one million, six hundred sixty-four thousand, seven hundred sixty-nine".