1665057659 has 2 divisors, whose sum is σ = 1665057660. Its totient is φ = 1665057658.

The previous prime is 1665057637. The next prime is 1665057661. The reversal of 1665057659 is 9567505661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1665057659 - 2¹⁶ = 1664992123 is a prime.

It is a Sophie Germain prime.

Together with 1665057661, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1665057679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832528829 + 832528830.

It is an arithmetic number, because the mean of its divisors is an integer number (832528830).

Almost surely, 2^1665057659 is an apocalyptic number.

1665057659 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665057659 is an equidigital number, since it uses as much as digits as its factorization.

1665057659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1701000, while the sum is 50.

The square root of 1665057659 is about 40805.1180490879. The cubic root of 1665057659 is about 1185.2494407449.

The spelling of 1665057659 in words is "one billion, six hundred sixty-five million, fifty-seven thousand, six hundred fifty-nine".