165740623 has 2 divisors, whose sum is σ = 165740624. Its totient is φ = 165740622.

The previous prime is 165740611. The next prime is 165740651. The reversal of 165740623 is 326047561.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165740623 - 2²⁵ = 132186191 is a prime.

It is a super-2 number, since 2×165740623² = 54939908224856258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165740683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82870311 + 82870312.

It is an arithmetic number, because the mean of its divisors is an integer number (82870312).

Almost surely, 2^165740623 is an apocalyptic number.

165740623 is a deficient number, since it is larger than the sum of its proper divisors (1).

165740623 is an equidigital number, since it uses as much as digits as its factorization.

165740623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 165740623 is about 12874.0290119294. The cubic root of 165740623 is about 549.3000716346.

The spelling of 165740623 in words is "one hundred sixty-five million, seven hundred forty thousand, six hundred twenty-three".