2656446561 has 24 divisors (see below), whose sum is σ = 4032462720. Its totient is φ = 1683019296.

The previous prime is 2656446557. The next prime is 2656446581. The reversal of 2656446561 is 1656446562.

2656446561 is a `hidden beast` number, since 26 + 5 + 64 + 4 + 6 + 561 = 666.

It is not a de Polignac number, because 2656446561 - 2² = 2656446557 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2656446581) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78441 + ... + 107078.

It is an arithmetic number, because the mean of its divisors is an integer number (168019280).

Almost surely, 2^2656446561 is an apocalyptic number.

It is an amenable number.

2656446561 is a deficient number, since it is larger than the sum of its proper divisors (1376016159).

2656446561 is a wasteful number, since it uses less digits than its factorization.

2656446561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185605 (or 185602 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The square root of 2656446561 is about 51540.7272067440. The cubic root of 2656446561 is about 1384.9487243112.

Subtracting from 2656446561 its reverse (1656446562), we obtain a palindrome (999999999).

The spelling of 2656446561 in words is "two billion, six hundred fifty-six million, four hundred forty-six thousand, five hundred sixty-one".