56066561556221 has 8 divisors (see below), whose sum is σ = 56581118563200. Its totient is φ = 55552007910960.

The previous prime is 56066561556217. The next prime is 56066561556277. The reversal of 56066561556221 is 12265516566065.

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 56066561556221 - 2² = 56066561556217 is a prime.

It is a super-2 number, since 2×56066561556221² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56066561556721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43217936 + ... + 44496326.

It is an arithmetic number, because the mean of its divisors is an integer number (7072639820400).

Almost surely, 2^{56066561556221} is an apocalyptic number.

It is an amenable number.

56066561556221 is a deficient number, since it is larger than the sum of its proper divisors (514557006979).

56066561556221 is a wasteful number, since it uses less digits than its factorization.

56066561556221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680859.

The product of its (nonzero) digits is 19440000, while the sum is 56.

The spelling of 56066561556221 in words is "fifty-six trillion, sixty-six billion, five hundred sixty-one million, five hundred fifty-six thousand, two hundred twenty-one".