2657936561 has 8 divisors (see below), whose sum is σ = 3111730944. Its totient is φ = 2222664480.

The previous prime is 2657936539. The next prime is 2657936563. The reversal of 2657936561 is 1656397562.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2657936561 - 2¹⁰ = 2657935537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2657936563) 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 7 ways as a sum of consecutive naturals, for example, 4630265 + ... + 4630838.

It is an arithmetic number, because the mean of its divisors is an integer number (388966368).

Almost surely, 2^2657936561 is an apocalyptic number.

It is an amenable number.

2657936561 is a deficient number, since it is larger than the sum of its proper divisors (453794383).

2657936561 is an equidigital number, since it uses as much as digits as its factorization.

2657936561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9261151.

The product of its digits is 2041200, while the sum is 50.

The square root of 2657936561 is about 51555.1797688651. The cubic root of 2657936561 is about 1385.2076150076.

The spelling of 2657936561 in words is "two billion, six hundred fifty-seven million, nine hundred thirty-six thousand, five hundred sixty-one".