1660559 has 2 divisors, whose sum is σ = 1660560. Its totient is φ = 1660558.

The previous prime is 1660553. The next prime is 1660573. The reversal of 1660559 is 9550661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1660559 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830279 + 830280.

It is an arithmetic number, because the mean of its divisors is an integer number (830280).

2^1660559 is an apocalyptic number.

1660559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660559 is an equidigital number, since it uses as much as digits as its factorization.

1660559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 1660559 is about 1288.6267884845. The cubic root of 1660559 is about 118.4181040843.

The spelling of 1660559 in words is "one million, six hundred sixty thousand, five hundred fifty-nine".