4251661056 has 144 divisors (see below), whose sum is σ = 12726107520. Its totient is φ = 1399956480.

The previous prime is 4251661039. The next prime is 4251661079. The reversal of 4251661056 is 6501661524.

4251661056 is a `hidden beast` number, since 4 + 25 + 16 + 610 + 5 + 6 = 666.

4251661056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 4251661056.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 569991 + ... + 577401.

Almost surely, 2^4251661056 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 4251661056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6363053760).

4251661056 is an abundant number, since it is smaller than the sum of its proper divisors (8474446464).

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

4251661056 is an equidigital number, since it uses as much as digits as its factorization.

4251661056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7519 (or 7499 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 4251661056 is about 65204.7625254475. The cubic root of 4251661056 is about 1620.0168996865.

The spelling of 4251661056 in words is "four billion, two hundred fifty-one million, six hundred sixty-one thousand, fifty-six".