55616566 has 16 divisors (see below), whose sum is σ = 85442544. Its totient is φ = 27143424.

The previous prime is 55616563. The next prime is 55616593. The reversal of 55616566 is 66561655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55616563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13306 + ... + 16978.

It is an arithmetic number, because the mean of its divisors is an integer number (5340159).

Almost surely, 2^55616566 is an apocalyptic number.

55616566 is a deficient number, since it is larger than the sum of its proper divisors (29825978).

55616566 is a wasteful number, since it uses less digits than its factorization.

55616566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3855.

The product of its digits is 162000, while the sum is 40.

The square root of 55616566 is about 7457.6515070094. The cubic root of 55616566 is about 381.7110421337.

The spelling of 55616566 in words is "fifty-five million, six hundred sixteen thousand, five hundred sixty-six".