165993743 has 2 divisors, whose sum is σ = 165993744. Its totient is φ = 165993742.

The previous prime is 165993739. The next prime is 165993761. The reversal of 165993743 is 347399561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165993743 - 2² = 165993739 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165993643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82996871 + 82996872.

It is an arithmetic number, because the mean of its divisors is an integer number (82996872).

Almost surely, 2^165993743 is an apocalyptic number.

165993743 is a deficient number, since it is larger than the sum of its proper divisors (1).

165993743 is an equidigital number, since it uses as much as digits as its factorization.

165993743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 47.

The square root of 165993743 is about 12883.8559057450. The cubic root of 165993743 is about 549.5795607771.

The spelling of 165993743 in words is "one hundred sixty-five million, nine hundred ninety-three thousand, seven hundred forty-three".