1665938303 has 2 divisors, whose sum is σ = 1665938304. Its totient is φ = 1665938302.

The previous prime is 1665938291. The next prime is 1665938353. The reversal of 1665938303 is 3038395661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1665938303 - 2²⁰ = 1664889727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665938353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832969151 + 832969152.

It is an arithmetic number, because the mean of its divisors is an integer number (832969152).

Almost surely, 2^1665938303 is an apocalyptic number.

1665938303 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665938303 is an equidigital number, since it uses as much as digits as its factorization.

1665938303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 1665938303 is about 40815.9074749049. The cubic root of 1665938303 is about 1185.4583622076.

The spelling of 1665938303 in words is "one billion, six hundred sixty-five million, nine hundred thirty-eight thousand, three hundred three".