165617206193 has 2 divisors, whose sum is σ = 165617206194. Its totient is φ = 165617206192.

The previous prime is 165617206171. The next prime is 165617206207. The reversal of 165617206193 is 391602716561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109804088689 + 55813117504 = 331367^2 + 236248^2 .

It is a cyclic number.

It is not a de Polignac number, because 165617206193 - 2¹² = 165617202097 is a prime.

It is not a weakly prime, because it can be changed into another prime (165617206163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82808603096 + 82808603097.

It is an arithmetic number, because the mean of its divisors is an integer number (82808603097).

Almost surely, 2^165617206193 is an apocalyptic number.

It is an amenable number.

165617206193 is a deficient number, since it is larger than the sum of its proper divisors (1).

165617206193 is an equidigital number, since it uses as much as digits as its factorization.

165617206193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 165617206193 in words is "one hundred sixty-five billion, six hundred seventeen million, two hundred six thousand, one hundred ninety-three".