51113255553 has 16 divisors (see below), whose sum is σ = 76115698240. Its totient is φ = 33898943232.

The previous prime is 51113255549. The next prime is 51113255569. The reversal of 51113255553 is 35555231115.

51113255553 is a `hidden beast` number, since 51 + 1 + 1 + 3 + 2 + 55 + 553 = 666.

It is not a de Polignac number, because 51113255553 - 2² = 51113255549 is a prime.

It is a super-2 number, since 2×51113255553² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51113255573) 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 15 ways as a sum of consecutive naturals, for example, 4899151 + ... + 4909572.

It is an arithmetic number, because the mean of its divisors is an integer number (4757231140).

Almost surely, 2^51113255553 is an apocalyptic number.

It is an amenable number.

51113255553 is a deficient number, since it is larger than the sum of its proper divisors (25002442687).

51113255553 is a wasteful number, since it uses less digits than its factorization.

51113255553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9808925 (or 9808919 counting only the distinct ones).

The product of its digits is 56250, while the sum is 36.

Adding to 51113255553 its reverse (35555231115), we get a palindrome (86668486668).

The spelling of 51113255553 in words is "fifty-one billion, one hundred thirteen million, two hundred fifty-five thousand, five hundred fifty-three".