55666779 has 8 divisors (see below), whose sum is σ = 84825600. Its totient is φ = 31809576.

The previous prime is 55666771. The next prime is 55666813. The reversal of 55666779 is 97766655.

55666779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 55666779 - 2³ = 55666771 is a prime.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55666771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1325379 + ... + 1325420.

It is an arithmetic number, because the mean of its divisors is an integer number (10603200).

Almost surely, 2^55666779 is an apocalyptic number.

55666779 is a deficient number, since it is larger than the sum of its proper divisors (29158821).

55666779 is a wasteful number, since it uses less digits than its factorization.

55666779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650809.

The product of its digits is 2381400, while the sum is 51.

The square root of 55666779 is about 7461.0172898875. The cubic root of 55666779 is about 381.8258825647.

The spelling of 55666779 in words is "fifty-five million, six hundred sixty-six thousand, seven hundred seventy-nine".