55566779 has 4 divisors (see below), whose sum is σ = 55966680. Its totient is φ = 55166880.

The previous prime is 55566751. The next prime is 55566799. The reversal of 55566779 is 97766555.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55566779 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55566739) by changing a digit.

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, 199742 + ... + 200019.

It is an arithmetic number, because the mean of its divisors is an integer number (13991670).

Almost surely, 2^55566779 is an apocalyptic number.

55566779 is a deficient number, since it is larger than the sum of its proper divisors (399901).

55566779 is a wasteful number, since it uses less digits than its factorization.

55566779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399900.

The product of its digits is 1984500, while the sum is 50.

The square root of 55566779 is about 7454.3127785196. The cubic root of 55566779 is about 381.5971077277.

The spelling of 55566779 in words is "fifty-five million, five hundred sixty-six thousand, seven hundred seventy-nine".