165571206667 has 2 divisors, whose sum is σ = 165571206668. Its totient is φ = 165571206666.

The previous prime is 165571206641. The next prime is 165571206679. The reversal of 165571206667 is 766602175561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165571206667 - 2²⁷ = 165436988939 is a prime.

It is not a weakly prime, because it can be changed into another prime (165571206067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82785603333 + 82785603334.

It is an arithmetic number, because the mean of its divisors is an integer number (82785603334).

Almost surely, 2^165571206667 is an apocalyptic number.

165571206667 is a deficient number, since it is larger than the sum of its proper divisors (1).

165571206667 is an equidigital number, since it uses as much as digits as its factorization.

165571206667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3175200, while the sum is 52.

The spelling of 165571206667 in words is "one hundred sixty-five billion, five hundred seventy-one million, two hundred six thousand, six hundred sixty-seven".