165245723 has 2 divisors, whose sum is σ = 165245724. Its totient is φ = 165245722.

The previous prime is 165245711. The next prime is 165245753. The reversal of 165245723 is 327542561.

It is a weak prime.

It is an emirp because it is prime and its reverse (327542561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165245723 - 2¹⁰ = 165244699 is a prime.

It is a super-2 number, since 2×165245723² = 54612297939585458, which contains 22 as substring.

It is equal to p_9251909 and since 165245723 and 9251909 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (165245753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82622861 + 82622862.

It is an arithmetic number, because the mean of its divisors is an integer number (82622862).

Almost surely, 2^165245723 is an apocalyptic number.

165245723 is a deficient number, since it is larger than the sum of its proper divisors (1).

165245723 is an equidigital number, since it uses as much as digits as its factorization.

165245723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 35.

The square root of 165245723 is about 12854.7937750864. The cubic root of 165245723 is about 548.7527915342.

The spelling of 165245723 in words is "one hundred sixty-five million, two hundred forty-five thousand, seven hundred twenty-three".