55663511556 has 12 divisors (see below), whose sum is σ = 129881526992. Its totient is φ = 18554503848.

The previous prime is 55663511531. The next prime is 55663511569. The reversal of 55663511556 is 65511536655.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×55663511556² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

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, 2319312970 + ... + 2319312993.

Almost surely, 2^55663511556 is an apocalyptic number.

It is an amenable number.

55663511556 is an abundant number, since it is smaller than the sum of its proper divisors (74218015436).

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

55663511556 is a wasteful number, since it uses less digits than its factorization.

55663511556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4638625970 (or 4638625968 counting only the distinct ones).

The product of its digits is 2025000, while the sum is 48.

The spelling of 55663511556 in words is "fifty-five billion, six hundred sixty-three million, five hundred eleven thousand, five hundred fifty-six".