1663059509 has 2 divisors, whose sum is σ = 1663059510. Its totient is φ = 1663059508.

The previous prime is 1663059499. The next prime is 1663059547. The reversal of 1663059509 is 9059503661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1503112900 + 159946609 = 38770^2 + 12647^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1663059509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1663059509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663059109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831529754 + 831529755.

It is an arithmetic number, because the mean of its divisors is an integer number (831529755).

Almost surely, 2^1663059509 is an apocalyptic number.

It is an amenable number.

1663059509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663059509 is an equidigital number, since it uses as much as digits as its factorization.

1663059509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 218700, while the sum is 44.

The square root of 1663059509 is about 40780.6266381477. The cubic root of 1663059509 is about 1184.7751320125.

The spelling of 1663059509 in words is "one billion, six hundred sixty-three million, fifty-nine thousand, five hundred nine".