55451569920 has 288 divisors, whose sum is σ = 192440801280. Its totient is φ = 13556367360.

The previous prime is 55451569913. The next prime is 55451569933. The reversal of 55451569920 is 2996515455.

It is a happy number.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 2249502 + ... + 2274018.

Almost surely, 2^55451569920 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 55451569920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96220400640).

55451569920 is an abundant number, since it is smaller than the sum of its proper divisors (136989231360).

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

55451569920 is a wasteful number, since it uses less digits than its factorization.

55451569920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24591 (or 24577 counting only the distinct ones).

The product of its (nonzero) digits is 2430000, while the sum is 51.

The spelling of 55451569920 in words is "fifty-five billion, four hundred fifty-one million, five hundred sixty-nine thousand, nine hundred twenty".