55661384484566 has 48 divisors (see below), whose sum is σ = 99496252119600. Its totient is φ = 23272128391680.

The previous prime is 55661384484557. The next prime is 55661384484571. The reversal of 55661384484566 is 66548448316655.

It is a self number, because there is not a number n which added to its sum of digits gives 55661384484566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106010201 + ... + 106533963.

It is an arithmetic number, because the mean of its divisors is an integer number (2072838585825).

Almost surely, 2^{55661384484566} is an apocalyptic number.

55661384484566 is a deficient number, since it is larger than the sum of its proper divisors (43834867635034).

55661384484566 is a wasteful number, since it uses less digits than its factorization.

55661384484566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550269 (or 550262 counting only the distinct ones).

The product of its digits is 1990656000, while the sum is 71.

The spelling of 55661384484566 in words is "fifty-five trillion, six hundred sixty-one billion, three hundred eighty-four million, four hundred eighty-four thousand, five hundred sixty-six".