2005154550 has 144 divisors (see below), whose sum is σ = 6481013760. Its totient is φ = 434185920.

The previous prime is 2005154533. The next prime is 2005154611. The reversal of 2005154550 is 554515002.

2005154550 is a `hidden beast` number, since 20 + 0 + 51 + 545 + 50 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 43099 + ... + 76601.

It is an arithmetic number, because the mean of its divisors is an integer number (45007040).

Almost surely, 2^2005154550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2005154550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3240506880).

2005154550 is an abundant number, since it is smaller than the sum of its proper divisors (4475859210).

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

2005154550 is a wasteful number, since it uses less digits than its factorization.

2005154550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33547 (or 33539 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 2005154550 is about 44778.9520868901. The cubic root of 2005154550 is about 1261.0025090284.

Adding to 2005154550 its reverse (554515002), we get a palindrome (2559669552).

The spelling of 2005154550 in words is "two billion, five million, one hundred fifty-four thousand, five hundred fifty".