55120052500 has 30 divisors (see below), whose sum is σ = 120536536274. Its totient is φ = 22048020000.

The previous prime is 55120052489. The next prime is 55120052501. The reversal of 55120052500 is 525002155.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 7894677904 + 47225374596 = 88852^2 + 217314^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55120052501) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 11021511 + ... + 11026510.

Almost surely, 2^55120052500 is an apocalyptic number.

55120052500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55120052500 is an abundant number, since it is smaller than the sum of its proper divisors (65416483774).

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

55120052500 is a wasteful number, since it uses less digits than its factorization.

55120052500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22048045 (or 22048028 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

Adding to 55120052500 its reverse (525002155), we get a palindrome (55645054655).

The spelling of 55120052500 in words is "fifty-five billion, one hundred twenty million, fifty-two thousand, five hundred".