56617271666 has 8 divisors (see below), whose sum is σ = 86365329840. Its totient is φ = 27828828388.

The previous prime is 56617271621. The next prime is 56617271671. The reversal of 56617271666 is 66617271665.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239903576 + ... + 239903811.

It is an arithmetic number, because the mean of its divisors is an integer number (10795666230).

Almost surely, 2^56617271666 is an apocalyptic number.

56617271666 is a deficient number, since it is larger than the sum of its proper divisors (29748058174).

56617271666 is a wasteful number, since it uses less digits than its factorization.

56617271666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479807448.

The product of its digits is 3810240, while the sum is 53.

Subtracting 56617271666 from its reverse (66617271665), we obtain a palindrome (9999999999).

The spelling of 56617271666 in words is "fifty-six billion, six hundred seventeen million, two hundred seventy-one thousand, six hundred sixty-six".