1665798073 has 2 divisors, whose sum is σ = 1665798074. Its totient is φ = 1665798072.

The previous prime is 1665798047. The next prime is 1665798089. The reversal of 1665798073 is 3708975661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1126072249 + 539725824 = 33557^2 + 23232^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665798073 - 2⁹ = 1665797561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1665798073.

It is not a weakly prime, because it can be changed into another prime (1665798373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832899036 + 832899037.

It is an arithmetic number, because the mean of its divisors is an integer number (832899037).

Almost surely, 2^1665798073 is an apocalyptic number.

It is an amenable number.

1665798073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665798073 is an equidigital number, since it uses as much as digits as its factorization.

1665798073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The square root of 1665798073 is about 40814.1896036170. The cubic root of 1665798073 is about 1185.4250993730.

The spelling of 1665798073 in words is "one billion, six hundred sixty-five million, seven hundred ninety-eight thousand, seventy-three".