1665533 has 2 divisors, whose sum is σ = 1665534. Its totient is φ = 1665532.

The previous prime is 1665529. The next prime is 1665563. The reversal of 1665533 is 3355661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 851929 + 813604 = 923^2 + 902^2 .

It is an emirp because it is prime and its reverse (3355661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1665533 - 2² = 1665529 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1665496 and 1665505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832766 + 832767.

It is an arithmetic number, because the mean of its divisors is an integer number (832767).

2^1665533 is an apocalyptic number.

It is an amenable number.

1665533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665533 is an equidigital number, since it uses as much as digits as its factorization.

1665533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 29.

The square root of 1665533 is about 1290.5553068350. Note that the first 3 decimals coincide. The cubic root of 1665533 is about 118.5362218431.

The spelling of 1665533 in words is "one million, six hundred sixty-five thousand, five hundred thirty-three".