55666563696 has 120 divisors (see below), whose sum is σ = 157880582496. Its totient is φ = 18307699200.

The previous prime is 55666563649. The next prime is 55666563709. The reversal of 55666563696 is 69636566655.

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, 4254861 + ... + 4267923.

Almost surely, 2^55666563696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55666563696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78940291248).

55666563696 is an abundant number, since it is smaller than the sum of its proper divisors (102214018800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55666563696 is a wasteful number, since it uses less digits than its factorization.

55666563696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13471 (or 13462 counting only the distinct ones).

The product of its digits is 157464000, while the sum is 63.

The spelling of 55666563696 in words is "fifty-five billion, six hundred sixty-six million, five hundred sixty-three thousand, six hundred ninety-six".