165642143 has 2 divisors, whose sum is σ = 165642144. Its totient is φ = 165642142.

The previous prime is 165642109. The next prime is 165642151. The reversal of 165642143 is 341246561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165642143 - 2⁶ = 165642079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165642943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82821071 + 82821072.

It is an arithmetic number, because the mean of its divisors is an integer number (82821072).

Almost surely, 2^165642143 is an apocalyptic number.

165642143 is a deficient number, since it is larger than the sum of its proper divisors (1).

165642143 is an equidigital number, since it uses as much as digits as its factorization.

165642143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 165642143 is about 12870.2036891418. The cubic root of 165642143 is about 549.1912554459.

The spelling of 165642143 in words is "one hundred sixty-five million, six hundred forty-two thousand, one hundred forty-three".