56658185666 has 4 divisors (see below), whose sum is σ = 84987278502. Its totient is φ = 28329092832.

The previous prime is 56658185651. The next prime is 56658185693. The reversal of 56658185666 is 66658185665.

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

It can be written as a sum of positive squares in only one way, i.e., 30600155041 + 26058030625 = 174929^2 + 161425^2 .

It is a junction number, because it is equal to n+sod(n) for n = 56658185599 and 56658185608.

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 as a sum of consecutive naturals, namely, 14164546415 + ... + 14164546418.

Almost surely, 2^56658185666 is an apocalyptic number.

56658185666 is a deficient number, since it is larger than the sum of its proper divisors (28329092836).

56658185666 is a wasteful number, since it uses less digits than its factorization.

56658185666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28329092835.

The product of its digits is 62208000, while the sum is 62.

Subtracting 56658185666 from its reverse (66658185665), we obtain a palindrome (9999999999).

The spelling of 56658185666 in words is "fifty-six billion, six hundred fifty-eight million, one hundred eighty-five thousand, six hundred sixty-six".