55006661566 has 8 divisors (see below), whose sum is σ = 82574507520. Its totient is φ = 27481825728.

The previous prime is 55006661561. The next prime is 55006661579. The reversal of 55006661566 is 66516660055.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55006661561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10749331 + ... + 10754446.

It is an arithmetic number, because the mean of its divisors is an integer number (10321813440).

Almost surely, 2^55006661566 is an apocalyptic number.

55006661566 is a deficient number, since it is larger than the sum of its proper divisors (27567845954).

55006661566 is a wasteful number, since it uses less digits than its factorization.

55006661566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21505058.

The product of its (nonzero) digits is 972000, while the sum is 46.

The spelling of 55006661566 in words is "fifty-five billion, six million, six hundred sixty-one thousand, five hundred sixty-six".