655606566161 has 4 divisors (see below), whose sum is σ = 655618926900. Its totient is φ = 655594205424.

The previous prime is 655606566133. The next prime is 655606566169. The reversal of 655606566161 is 161665606556.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31378579600 + 624227986561 = 177140^2 + 790081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655606566161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655606566169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6100466 + ... + 6207003.

It is an arithmetic number, because the mean of its divisors is an integer number (163904731725).

Almost surely, 2^655606566161 is an apocalyptic number.

It is an amenable number.

655606566161 is a deficient number, since it is larger than the sum of its proper divisors (12360739).

655606566161 is a wasteful number, since it uses less digits than its factorization.

655606566161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12360738.

The product of its (nonzero) digits is 5832000, while the sum is 53.

The spelling of 655606566161 in words is "six hundred fifty-five billion, six hundred six million, five hundred sixty-six thousand, one hundred sixty-one".