165643607 has 2 divisors, whose sum is σ = 165643608. Its totient is φ = 165643606.

The previous prime is 165643523. The next prime is 165643613. The reversal of 165643607 is 706346561.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (706346561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165643607 - 2²² = 161449303 is a prime.

It is a Chen prime.

It is equal to p_9272837 and since 165643607 and 9272837 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165643627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82821803 + 82821804.

It is an arithmetic number, because the mean of its divisors is an integer number (82821804).

Almost surely, 2^165643607 is an apocalyptic number.

165643607 is a deficient number, since it is larger than the sum of its proper divisors (1).

165643607 is an equidigital number, since it uses as much as digits as its factorization.

165643607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 165643607 is about 12870.2605645729. The cubic root of 165643607 is about 549.1928734191.

The spelling of 165643607 in words is "one hundred sixty-five million, six hundred forty-three thousand, six hundred seven".