56421317809 has 8 divisors (see below), whose sum is σ = 56988085032. Its totient is φ = 55854710400.

The previous prime is 56421317803. The next prime is 56421317831. The reversal of 56421317809 is 90871312465.

It can be written as a sum of positive squares in 4 ways, for example, as 29468872225 + 26952445584 = 171665^2 + 164172^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 56421317809 - 2¹¹ = 56421315761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56421317803) 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, 747027 + ... + 819079.

It is an arithmetic number, because the mean of its divisors is an integer number (7123510629).

It is a 1-persistent number, because it is pandigital, but 2⋅56421317809 = 112842635618 is not.

Almost surely, 2^56421317809 is an apocalyptic number.

It is an amenable number.

56421317809 is a deficient number, since it is larger than the sum of its proper divisors (566767223).

56421317809 is a wasteful number, since it uses less digits than its factorization.

56421317809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79907.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 56421317809 in words is "fifty-six billion, four hundred twenty-one million, three hundred seventeen thousand, eight hundred nine".