2656956985 has 4 divisors (see below), whose sum is σ = 3188348388. Its totient is φ = 2125565584.

The previous prime is 2656956977. The next prime is 2656957019. The reversal of 2656956985 is 5896596562.

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 777907881 + 1879049104 = 27891^2 + 43348^2 .

It is a cyclic number.

It is not a de Polignac number, because 2656956985 - 2³ = 2656956977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265695694 + ... + 265695703.

It is an arithmetic number, because the mean of its divisors is an integer number (797087097).

Almost surely, 2^2656956985 is an apocalyptic number.

It is an amenable number.

2656956985 is a deficient number, since it is larger than the sum of its proper divisors (531391403).

2656956985 is an equidigital number, since it uses as much as digits as its factorization.

2656956985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531391402.

The product of its digits is 34992000, while the sum is 61.

The square root of 2656956985 is about 51545.6786258557. The cubic root of 2656956985 is about 1385.0374224750.

The spelling of 2656956985 in words is "two billion, six hundred fifty-six million, nine hundred fifty-six thousand, nine hundred eighty-five".