5256056721 has 8 divisors (see below), whose sum is σ = 7104076960. Its totient is φ = 3456037152.

The previous prime is 5256056717. The next prime is 5256056723. The reversal of 5256056721 is 1276506525.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5256056721 - 2² = 5256056717 is a prime.

It is a super-2 number, since 2×5256056721² = 55252264508738543682, which contains 22 as substring.

It is a Duffinian number.

5256056721 is a modest number, since divided by 56721 gives 5256 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 5256056721.

It is not an unprimeable number, because it can be changed into a prime (5256056723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11999911 + ... + 12000348.

It is an arithmetic number, because the mean of its divisors is an integer number (888009620).

Almost surely, 2^5256056721 is an apocalyptic number.

It is an amenable number.

5256056721 is a deficient number, since it is larger than the sum of its proper divisors (1848020239).

5256056721 is a wasteful number, since it uses less digits than its factorization.

5256056721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24000335.

The product of its (nonzero) digits is 126000, while the sum is 39.

The square root of 5256056721 is about 72498.6670291254. The cubic root of 5256056721 is about 1738.6814250663.

The spelling of 5256056721 in words is "five billion, two hundred fifty-six million, fifty-six thousand, seven hundred twenty-one".