55844816640 has 144 divisors (see below), whose sum is σ = 178468327968. Its totient is φ = 14882439168.

The previous prime is 55844816639. The next prime is 55844816641. The reversal of 55844816640 is 4661844855.

It is an interprime number because it is at equal distance from previous prime (55844816639) and next prime (55844816641).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55844816641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7649472 + ... + 7656768.

Almost surely, 2^55844816640 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 55844816640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89234163984).

55844816640 is an abundant number, since it is smaller than the sum of its proper divisors (122623511328).

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

55844816640 is a wasteful number, since it uses less digits than its factorization.

55844816640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9314 (or 9300 counting only the distinct ones).

The product of its (nonzero) digits is 3686400, while the sum is 51.

The spelling of 55844816640 in words is "fifty-five billion, eight hundred forty-four million, eight hundred sixteen thousand, six hundred forty".