55249931520 has 720 divisors, whose sum is σ = 227577651840. Its totient is φ = 12537151488.

The previous prime is 55249931519. The next prime is 55249931533. The reversal of 55249931520 is 2513994255.

55249931520 is a `hidden beast` number, since 5 + 5 + 2 + 4 + 99 + 31 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 195229299 + ... + 195229581.

It is an arithmetic number, because the mean of its divisors is an integer number (316080072).

Almost surely, 2^55249931520 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 55249931520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113788825920).

55249931520 is an abundant number, since it is smaller than the sum of its proper divisors (172327720320).

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

55249931520 is a wasteful number, since it uses less digits than its factorization.

55249931520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592 (or 569 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 45.

The spelling of 55249931520 in words is "fifty-five billion, two hundred forty-nine million, nine hundred thirty-one thousand, five hundred twenty".