165819743 has 2 divisors, whose sum is σ = 165819744. Its totient is φ = 165819742.

The previous prime is 165819733. The next prime is 165819749. The reversal of 165819743 is 347918561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165819743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165819694 and 165819703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165819749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82909871 + 82909872.

It is an arithmetic number, because the mean of its divisors is an integer number (82909872).

Almost surely, 2^165819743 is an apocalyptic number.

165819743 is a deficient number, since it is larger than the sum of its proper divisors (1).

165819743 is an equidigital number, since it uses as much as digits as its factorization.

165819743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 165819743 is about 12877.1014983963. The cubic root of 165819743 is about 549.3874646287.

The spelling of 165819743 in words is "one hundred sixty-five million, eight hundred nineteen thousand, seven hundred forty-three".