51215556513 has 16 divisors (see below), whose sum is σ = 74579383296. Its totient is φ = 31004719440.

The previous prime is 51215556503. The next prime is 51215556529. The reversal of 51215556513 is 31565551215.

It is not a de Polignac number, because 51215556513 - 2⁶ = 51215556449 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51215556503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 845581 + ... + 904122.

It is an arithmetic number, because the mean of its divisors is an integer number (4661211456).

Almost surely, 2^51215556513 is an apocalyptic number.

It is an amenable number.

51215556513 is a deficient number, since it is larger than the sum of its proper divisors (23363826783).

51215556513 is a wasteful number, since it uses less digits than its factorization.

51215556513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750604.

The product of its digits is 112500, while the sum is 39.

The spelling of 51215556513 in words is "fifty-one billion, two hundred fifteen million, five hundred fifty-six thousand, five hundred thirteen".