2656620440 has 16 divisors (see below), whose sum is σ = 5977396080. Its totient is φ = 1062648160.

The previous prime is 2656620437. The next prime is 2656620521. The reversal of 2656620440 is 440266562.

It is a self number, because there is not a number n which added to its sum of digits gives 2656620440.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 33207716 + ... + 33207795.

It is an arithmetic number, because the mean of its divisors is an integer number (373587255).

Almost surely, 2^2656620440 is an apocalyptic number.

2656620440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2656620440 is an abundant number, since it is smaller than the sum of its proper divisors (3320775640).

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

2656620440 is a wasteful number, since it uses less digits than its factorization.

2656620440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66415522 (or 66415518 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 2656620440 is about 51542.4139908095. The cubic root of 2656620440 is about 1384.9789411491.

The spelling of 2656620440 in words is "two billion, six hundred fifty-six million, six hundred twenty thousand, four hundred forty".