17660666533 has 2 divisors, whose sum is σ = 17660666534. Its totient is φ = 17660666532.

The previous prime is 17660666531. The next prime is 17660666537. The reversal of 17660666533 is 33566606671.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17340149124 + 320517409 = 131682^2 + 17903^2 .

It is a cyclic number.

It is not a de Polignac number, because 17660666533 - 2¹ = 17660666531 is a prime.

Together with 17660666531, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17660666531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8830333266 + 8830333267.

It is an arithmetic number, because the mean of its divisors is an integer number (8830333267).

Almost surely, 2^17660666533 is an apocalyptic number.

It is an amenable number.

17660666533 is a deficient number, since it is larger than the sum of its proper divisors (1).

17660666533 is an equidigital number, since it uses as much as digits as its factorization.

17660666533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 49.

The spelling of 17660666533 in words is "seventeen billion, six hundred sixty million, six hundred sixty-six thousand, five hundred thirty-three".