1655368609 has 2 divisors, whose sum is σ = 1655368610. Its totient is φ = 1655368608.

The previous prime is 1655368579. The next prime is 1655368613. The reversal of 1655368609 is 9068635561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1180128609 + 475240000 = 34353^2 + 21800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1655368609 - 2¹¹ = 1655366561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1655368699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827684304 + 827684305.

It is an arithmetic number, because the mean of its divisors is an integer number (827684305).

Almost surely, 2^1655368609 is an apocalyptic number.

It is an amenable number.

1655368609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655368609 is an equidigital number, since it uses as much as digits as its factorization.

1655368609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The square root of 1655368609 is about 40686.2213654697. The cubic root of 1655368609 is about 1182.9459592360.

The spelling of 1655368609 in words is "one billion, six hundred fifty-five million, three hundred sixty-eight thousand, six hundred nine".