51513616215 has 24 divisors (see below), whose sum is σ = 89338137408. Its totient is φ = 27459199680.

The previous prime is 51513616213. The next prime is 51513616243. The reversal of 51513616215 is 51261631515.

51513616215 is a `hidden beast` number, since 5 + 1 + 5 + 13 + 616 + 21 + 5 = 666.

It is not a de Polignac number, because 51513616215 - 2¹ = 51513616213 is a prime.

It is a super-3 number, since 3×51513616215³ (a number of 33 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51513616215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51513616211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 221724 + ... + 390113.

It is an arithmetic number, because the mean of its divisors is an integer number (3722422392).

Almost surely, 2^51513616215 is an apocalyptic number.

51513616215 is a deficient number, since it is larger than the sum of its proper divisors (37824521193).

51513616215 is a wasteful number, since it uses less digits than its factorization.

51513616215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613719 (or 613716 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The spelling of 51513616215 in words is "fifty-one billion, five hundred thirteen million, six hundred sixteen thousand, two hundred fifteen".