2656409868 has 144 divisors (see below), whose sum is σ = 8151736320. Its totient is φ = 712023552.

The previous prime is 2656409849. The next prime is 2656409879. The reversal of 2656409868 is 8689046562.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1639963 + ... + 1641581.

It is an arithmetic number, because the mean of its divisors is an integer number (56609280).

Almost surely, 2^2656409868 is an apocalyptic number.

2656409868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2656409868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4075868160).

2656409868 is an abundant number, since it is smaller than the sum of its proper divisors (5495326452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2656409868 is a wasteful number, since it uses less digits than its factorization.

2656409868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036 (or 2031 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The square root of 2656409868 is about 51540.3712442974. The cubic root of 2656409868 is about 1384.9423476026.

The spelling of 2656409868 in words is "two billion, six hundred fifty-six million, four hundred nine thousand, eight hundred sixty-eight".