1660809863 has 2 divisors, whose sum is σ = 1660809864. Its totient is φ = 1660809862.

The previous prime is 1660809859. The next prime is 1660809881. The reversal of 1660809863 is 3689080661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1660809863 - 2² = 1660809859 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660809833) 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, 830404931 + 830404932.

It is an arithmetic number, because the mean of its divisors is an integer number (830404932).

Almost surely, 2^1660809863 is an apocalyptic number.

1660809863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660809863 is an equidigital number, since it uses as much as digits as its factorization.

1660809863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 1660809863 is about 40753.0350158120. The cubic root of 1660809863 is about 1184.2406698090.

The spelling of 1660809863 in words is "one billion, six hundred sixty million, eight hundred nine thousand, eight hundred sixty-three".