55444660920 has 256 divisors, whose sum is σ = 201826252800. Its totient is φ = 13427182080.

The previous prime is 55444660877. The next prime is 55444660949. The reversal of 55444660920 is 2906644455.

55444660920 is a `hidden beast` number, since 5 + 544 + 46 + 60 + 9 + 2 + 0 = 666.

It is a super-2 number, since 2×55444660920² (a number of 22 digits) contains 22 as substring.

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 63 ways as a sum of consecutive naturals, for example, 15763002 + ... + 15766518.

It is an arithmetic number, because the mean of its divisors is an integer number (788383800).

Almost surely, 2^55444660920 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 55444660920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100913126400).

55444660920 is an abundant number, since it is smaller than the sum of its proper divisors (146381591880).

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

55444660920 is a wasteful number, since it uses less digits than its factorization.

55444660920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4875 (or 4865 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 55444660920 in words is "fifty-five billion, four hundred forty-four million, six hundred sixty thousand, nine hundred twenty".