16660606609 has 2 divisors, whose sum is σ = 16660606610. Its totient is φ = 16660606608.

The previous prime is 16660606597. The next prime is 16660606621. The reversal of 16660606609 is 90660606661.

It is a balanced prime because it is at equal distance from previous prime (16660606597) and next prime (16660606621).

It can be written as a sum of positive squares in only one way, i.e., 8440464384 + 8220142225 = 91872^2 + 90665^2 .

It is a cyclic number.

It is not a de Polignac number, because 16660606609 - 2⁷ = 16660606481 is a prime.

It is not a weakly prime, because it can be changed into another prime (16660606709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330303304 + 8330303305.

It is an arithmetic number, because the mean of its divisors is an integer number (8330303305).

Almost surely, 2^16660606609 is an apocalyptic number.

It is an amenable number.

16660606609 is a deficient number, since it is larger than the sum of its proper divisors (1).

16660606609 is an equidigital number, since it uses as much as digits as its factorization.

16660606609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 46.

The spelling of 16660606609 in words is "sixteen billion, six hundred sixty million, six hundred six thousand, six hundred nine".