51145000220 has 12 divisors (see below), whose sum is σ = 107404500504. Its totient is φ = 20458000080.

The previous prime is 51145000201. The next prime is 51145000229. The reversal of 51145000220 is 2200054115.

It is a super-2 number, since 2×51145000220² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 2557250011 = 51145000220 / (5 + 1 + 1 + 4 + 5 + 0 + 0 + 0 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 51145000192 and 51145000201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51145000229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1278624986 + ... + 1278625025.

It is an arithmetic number, because the mean of its divisors is an integer number (8950375042).

Almost surely, 2^51145000220 is an apocalyptic number.

It is an amenable number.

51145000220 is an abundant number, since it is smaller than the sum of its proper divisors (56259500284).

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

51145000220 is a wasteful number, since it uses less digits than its factorization.

51145000220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2557250020 (or 2557250018 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 51145000220 its reverse (2200054115), we get a palindrome (53345054335).

The spelling of 51145000220 in words is "fifty-one billion, one hundred forty-five million, two hundred twenty", and thus it is an aban number.