56666666678 has 8 divisors (see below), whose sum is σ = 90000000072. Its totient is φ = 26666666656.

The previous prime is 56666666671. The next prime is 56666666747. The reversal of 56666666678 is 87666666665.

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

It is a super-2 number, since 2×56666666678² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56666666671) 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, 833333300 + ... + 833333367.

It is an arithmetic number, because the mean of its divisors is an integer number (11250000009).

Almost surely, 2^56666666678 is an apocalyptic number.

56666666678 is a deficient number, since it is larger than the sum of its proper divisors (33333333394).

56666666678 is a wasteful number, since it uses less digits than its factorization.

56666666678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666666686.

The product of its digits is 470292480, while the sum is 68.

The spelling of 56666666678 in words is "fifty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred seventy-eight".