163666366277 has 2 divisors, whose sum is σ = 163666366278. Its totient is φ = 163666366276.

The previous prime is 163666366243. The next prime is 163666366289. The reversal of 163666366277 is 772663666361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113056665121 + 50609701156 = 336239^2 + 224966^2 .

It is a cyclic number.

It is not a de Polignac number, because 163666366277 - 2¹⁰ = 163666365253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163666386277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81833183138 + 81833183139.

It is an arithmetic number, because the mean of its divisors is an integer number (81833183139).

Almost surely, 2^163666366277 is an apocalyptic number.

It is an amenable number.

163666366277 is a deficient number, since it is larger than the sum of its proper divisors (1).

163666366277 is an equidigital number, since it uses as much as digits as its factorization.

163666366277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41150592, while the sum is 59.

The spelling of 163666366277 in words is "one hundred sixty-three billion, six hundred sixty-six million, three hundred sixty-six thousand, two hundred seventy-seven".