165664357 has 2 divisors, whose sum is σ = 165664358. Its totient is φ = 165664356.

The previous prime is 165664319. The next prime is 165664361. The reversal of 165664357 is 753466561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144144036 + 21520321 = 12006^2 + 4639^2 .

It is a cyclic number.

It is not a de Polignac number, because 165664357 - 2¹¹ = 165662309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165664307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82832178 + 82832179.

It is an arithmetic number, because the mean of its divisors is an integer number (82832179).

Almost surely, 2^165664357 is an apocalyptic number.

It is an amenable number.

165664357 is a deficient number, since it is larger than the sum of its proper divisors (1).

165664357 is an equidigital number, since it uses as much as digits as its factorization.

165664357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 43.

The square root of 165664357 is about 12871.0666613144. The cubic root of 165664357 is about 549.2158047323.

The spelling of 165664357 in words is "one hundred sixty-five million, six hundred sixty-four thousand, three hundred fifty-seven".