511720818225 has 12 divisors (see below), whose sum is σ = 846045086256. Its totient is φ = 272917769680.

The previous prime is 511720818223. The next prime is 511720818227. The reversal of 511720818225 is 522818027115.

It is an interprime number because it is at equal distance from previous prime (511720818223) and next prime (511720818227).

It is not a de Polignac number, because 511720818225 - 2¹ = 511720818223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (511720818223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3411472047 + ... + 3411472196.

It is an arithmetic number, because the mean of its divisors is an integer number (70503757188).

Almost surely, 2^511720818225 is an apocalyptic number.

It is an amenable number.

511720818225 is a deficient number, since it is larger than the sum of its proper divisors (334324268031).

511720818225 is a wasteful number, since it uses less digits than its factorization.

511720818225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6822944256 (or 6822944251 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 42.

The spelling of 511720818225 in words is "five hundred eleven billion, seven hundred twenty million, eight hundred eighteen thousand, two hundred twenty-five".