1655111609 has 2 divisors, whose sum is σ = 1655111610. Its totient is φ = 1655111608.

The previous prime is 1655111573. The next prime is 1655111629. The reversal of 1655111609 is 9061115561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1269853225 + 385258384 = 35635^2 + 19628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1655111609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1655111629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827555804 + 827555805.

It is an arithmetic number, because the mean of its divisors is an integer number (827555805).

Almost surely, 2^1655111609 is an apocalyptic number.

It is an amenable number.

1655111609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655111609 is an equidigital number, since it uses as much as digits as its factorization.

1655111609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 35.

The square root of 1655111609 is about 40683.0629254976. The cubic root of 1655111609 is about 1182.8847376558.

The spelling of 1655111609 in words is "one billion, six hundred fifty-five million, one hundred eleven thousand, six hundred nine".