51115100105550 has 96 divisors (see below), whose sum is σ = 136532141383680. Its totient is φ = 12580749475200.

The previous prime is 51115100105521. The next prime is 51115100105557. The reversal of 51115100105550 is 5550100151115.

It is a happy number.

It is a super-2 number, since 2×51115100105550² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51115100105557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15736311 + ... + 18704589.

It is an arithmetic number, because the mean of its divisors is an integer number (1422209806080).

Almost surely, 2^{51115100105550} is an apocalyptic number.

51115100105550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51115100105550 is an abundant number, since it is smaller than the sum of its proper divisors (85417041278130).

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

51115100105550 is a wasteful number, since it uses less digits than its factorization.

51115100105550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2977138 (or 2977133 counting only the distinct ones).

The product of its (nonzero) digits is 3125, while the sum is 30.

Adding to 51115100105550 its reverse (5550100151115), we get a palindrome (56665200256665).

The spelling of 51115100105550 in words is "fifty-one trillion, one hundred fifteen billion, one hundred million, one hundred five thousand, five hundred fifty".