1655305561 has 32 divisors (see below), whose sum is σ = 2132766720. Its totient is φ = 1248692544.

The previous prime is 1655305541. The next prime is 1655305579. The reversal of 1655305561 is 1655035561.

It is a cyclic number.

It is not a de Polignac number, because 1655305561 - 2¹¹ = 1655303513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1655305561.

It is not an unprimeable number, because it can be changed into a prime (1655305541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 750286 + ... + 752488.

It is an arithmetic number, because the mean of its divisors is an integer number (66648960).

Almost surely, 2^1655305561 is an apocalyptic number.

It is an amenable number.

1655305561 is a deficient number, since it is larger than the sum of its proper divisors (477461159).

1655305561 is a wasteful number, since it uses less digits than its factorization.

1655305561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2605.

The product of its (nonzero) digits is 67500, while the sum is 37.

The square root of 1655305561 is about 40685.4465503330. The cubic root of 1655305561 is about 1182.9309407635.

The spelling of 1655305561 in words is "one billion, six hundred fifty-five million, three hundred five thousand, five hundred sixty-one".