56660016561 has 8 divisors (see below), whose sum is σ = 75862784640. Its totient is φ = 37615296432.

The previous prime is 56660016503. The next prime is 56660016571. The reversal of 56660016561 is 16561006665.

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

It is not a de Polignac number, because 56660016561 - 2¹⁷ = 56659885489 is a prime.

It is a super-3 number, since 3×56660016561³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (56660016571) 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 7 ways as a sum of consecutive naturals, for example, 39511150 + ... + 39512583.

It is an arithmetic number, because the mean of its divisors is an integer number (9482848080).

Almost surely, 2^56660016561 is an apocalyptic number.

It is an amenable number.

56660016561 is a deficient number, since it is larger than the sum of its proper divisors (19202768079).

56660016561 is a wasteful number, since it uses less digits than its factorization.

56660016561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79023975.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 56660016561 in words is "fifty-six billion, six hundred sixty million, sixteen thousand, five hundred sixty-one".