51110056660 has 24 divisors (see below), whose sum is σ = 115587359496. Its totient is φ = 18871405440.

The previous prime is 51110056651. The next prime is 51110056661. The reversal of 51110056660 is 6665001115.

It can be written as a sum of positive squares in 4 ways, for example, as 8318169616 + 42791887044 = 91204^2 + 206862^2 .

It is a super-2 number, since 2×51110056660² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51110056661) 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 7 ways as a sum of consecutive naturals, for example, 98288311 + ... + 98288830.

It is an arithmetic number, because the mean of its divisors is an integer number (4816139979).

Almost surely, 2^51110056660 is an apocalyptic number.

It is an amenable number.

51110056660 is an abundant number, since it is smaller than the sum of its proper divisors (64477302836).

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

51110056660 is a wasteful number, since it uses less digits than its factorization.

51110056660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196577163 (or 196577161 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

Adding to 51110056660 its reverse (6665001115), we get a palindrome (57775057775).

The spelling of 51110056660 in words is "fifty-one billion, one hundred ten million, fifty-six thousand, six hundred sixty".