655111115561 has 32 divisors (see below), whose sum is σ = 779075125248. Its totient is φ = 539050489920.

The previous prime is 655111115557. The next prime is 655111115647. The reversal of 655111115561 is 165511111556.

It is a cyclic number.

It is not a de Polignac number, because 655111115561 - 2² = 655111115557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (655111115501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13670735 + ... + 13718571.

It is an arithmetic number, because the mean of its divisors is an integer number (24346097664).

Almost surely, 2^655111115561 is an apocalyptic number.

It is an amenable number.

655111115561 is a deficient number, since it is larger than the sum of its proper divisors (123964009687).

655111115561 is a wasteful number, since it uses less digits than its factorization.

655111115561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48381.

The product of its digits is 22500, while the sum is 38.

The spelling of 655111115561 in words is "six hundred fifty-five billion, one hundred eleven million, one hundred fifteen thousand, five hundred sixty-one".