2421665856 has 112 divisors (see below), whose sum is σ = 7240219200. Its totient is φ = 793506816.

The previous prime is 2421665849. The next prime is 2421665863. The reversal of 2421665856 is 6585661242.

2421665856 is a `hidden beast` number, since 2 + 4 + 2 + 1 + 66 + 585 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (2421665849) and next prime (2421665863).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90076 + ... + 113828.

Almost surely, 2^2421665856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2421665856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3620109600).

2421665856 is an abundant number, since it is smaller than the sum of its proper divisors (4818553344).

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

2421665856 is a wasteful number, since it uses less digits than its factorization.

2421665856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23833 (or 23817 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 2421665856 is about 49210.4242615322. The cubic root of 2421665856 is about 1342.8826810811.

The spelling of 2421665856 in words is "two billion, four hundred twenty-one million, six hundred sixty-five thousand, eight hundred fifty-six".