55663616988 has 240 divisors, whose sum is σ = 180707788800. Its totient is φ = 14580466560.

The previous prime is 55663616977. The next prime is 55663616989. The reversal of 55663616988 is 88961636655.

55663616988 is a `hidden beast` number, since 5 + 5 + 6 + 6 + 3 + 616 + 9 + 8 + 8 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55663616989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1315018 + ... + 1356686.

It is an arithmetic number, because the mean of its divisors is an integer number (752949120).

Almost surely, 2^55663616988 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 55663616988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90353894400).

55663616988 is an abundant number, since it is smaller than the sum of its proper divisors (125044171812).

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

55663616988 is a wasteful number, since it uses less digits than its factorization.

55663616988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41742 (or 41731 counting only the distinct ones).

The product of its digits is 55987200, while the sum is 63.

The spelling of 55663616988 in words is "fifty-five billion, six hundred sixty-three million, six hundred sixteen thousand, nine hundred eighty-eight".