1606217363609 has 2 divisors, whose sum is σ = 1606217363610. Its totient is φ = 1606217363608.

The previous prime is 1606217363603. The next prime is 1606217363669. The reversal of 1606217363609 is 9063637126061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1320844518400 + 285372845209 = 1149280^2 + 534203^2 .

It is a cyclic number.

It is not a de Polignac number, because 1606217363609 - 2³² = 1601922396313 is a prime.

It is not a weakly prime, because it can be changed into another prime (1606217363603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803108681804 + 803108681805.

It is an arithmetic number, because the mean of its divisors is an integer number (803108681805).

Almost surely, 2^{1606217363609} is an apocalyptic number.

It is an amenable number.

1606217363609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606217363609 is an equidigital number, since it uses as much as digits as its factorization.

1606217363609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 50.

The spelling of 1606217363609 in words is "one trillion, six hundred six billion, two hundred seventeen million, three hundred sixty-three thousand, six hundred nine".