1660804517 has 2 divisors, whose sum is σ = 1660804518. Its totient is φ = 1660804516.

The previous prime is 1660804489. The next prime is 1660804529. The reversal of 1660804517 is 7154080661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1610095876 + 50708641 = 40126^2 + 7121^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660804517 - 2¹⁴ = 1660788133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660801517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830402258 + 830402259.

It is an arithmetic number, because the mean of its divisors is an integer number (830402259).

Almost surely, 2^1660804517 is an apocalyptic number.

It is an amenable number.

1660804517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660804517 is an equidigital number, since it uses as much as digits as its factorization.

1660804517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 1660804517 is about 40752.9694255523. The cubic root of 1660804517 is about 1184.2393991523.

The spelling of 1660804517 in words is "one billion, six hundred sixty million, eight hundred four thousand, five hundred seventeen".