56211256613 has 4 divisors (see below), whose sum is σ = 56214471468. Its totient is φ = 56208041760.

The previous prime is 56211256609. The next prime is 56211256639. The reversal of 56211256613 is 31665211265.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32451500449 + 23759756164 = 180143^2 + 154142^2 .

It is a cyclic number.

It is not a de Polignac number, because 56211256613 - 2² = 56211256609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56211216613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1581056 + ... + 1616217.

It is an arithmetic number, because the mean of its divisors is an integer number (14053617867).

Almost surely, 2^56211256613 is an apocalyptic number.

It is an amenable number.

56211256613 is a deficient number, since it is larger than the sum of its proper divisors (3214855).

56211256613 is a wasteful number, since it uses less digits than its factorization.

56211256613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3214854.

The product of its digits is 64800, while the sum is 38.

Adding to 56211256613 its reverse (31665211265), we get a palindrome (87876467878).

The spelling of 56211256613 in words is "fifty-six billion, two hundred eleven million, two hundred fifty-six thousand, six hundred thirteen".