2656664240 has 40 divisors (see below), whose sum is σ = 6246162720. Its totient is φ = 1050722816.

The previous prime is 2656664207. The next prime is 2656664279. The reversal of 2656664240 is 424666562.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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, 179444 + ... + 193683.

It is an arithmetic number, because the mean of its divisors is an integer number (156154068).

Almost surely, 2^2656664240 is an apocalyptic number.

2656664240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2656664240 is an abundant number, since it is smaller than the sum of its proper divisors (3589498480).

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

2656664240 is a wasteful number, since it uses less digits than its factorization.

2656664240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373229 (or 373223 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 41.

The square root of 2656664240 is about 51542.8388818466. The cubic root of 2656664240 is about 1384.9865525418.

The spelling of 2656664240 in words is "two billion, six hundred fifty-six million, six hundred sixty-four thousand, two hundred forty".