1660859393 has 2 divisors, whose sum is σ = 1660859394. Its totient is φ = 1660859392.

The previous prime is 1660859311. The next prime is 1660859401. The reversal of 1660859393 is 3939580661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1623122944 + 37736449 = 40288^2 + 6143^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660859393 - 2¹⁸ = 1660597249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1660859093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830429696 + 830429697.

It is an arithmetic number, because the mean of its divisors is an integer number (830429697).

Almost surely, 2^1660859393 is an apocalyptic number.

It is an amenable number.

1660859393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660859393 is an equidigital number, since it uses as much as digits as its factorization.

1660859393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1049760, while the sum is 50.

The square root of 1660859393 is about 40753.6426960830. The cubic root of 1660859393 is about 1184.2524421494.

The spelling of 1660859393 in words is "one billion, six hundred sixty million, eight hundred fifty-nine thousand, three hundred ninety-three".