1655065681 has 2 divisors, whose sum is σ = 1655065682. Its totient is φ = 1655065680.

The previous prime is 1655065631. The next prime is 1655065693. The reversal of 1655065681 is 1865605561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1618050625 + 37015056 = 40225^2 + 6084^2 .

It is a cyclic number.

It is not a de Polignac number, because 1655065681 - 2¹⁷ = 1654934609 is a prime.

It is a super-2 number, since 2×1655065681² = 5478484816847987522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1655065631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827532840 + 827532841.

It is an arithmetic number, because the mean of its divisors is an integer number (827532841).

Almost surely, 2^1655065681 is an apocalyptic number.

It is an amenable number.

1655065681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655065681 is an equidigital number, since it uses as much as digits as its factorization.

1655065681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216000, while the sum is 43.

The square root of 1655065681 is about 40682.4984606403. The cubic root of 1655065681 is about 1182.8737961917.

The spelling of 1655065681 in words is "one billion, six hundred fifty-five million, sixty-five thousand, six hundred eighty-one".