51505115065 has 32 divisors (see below), whose sum is σ = 63167682816. Its totient is φ = 40307788800.

The previous prime is 51505115047. The next prime is 51505115099. The reversal of 51505115065 is 56051150515.

It is not a de Polignac number, because 51505115065 - 2⁹ = 51505114553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51505115065.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28597165 + ... + 28598965.

It is an arithmetic number, because the mean of its divisors is an integer number (1973990088).

Almost surely, 2^51505115065 is an apocalyptic number.

It is an amenable number.

51505115065 is a deficient number, since it is larger than the sum of its proper divisors (11662567751).

51505115065 is a wasteful number, since it uses less digits than its factorization.

51505115065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2529.

The product of its (nonzero) digits is 18750, while the sum is 34.

It can be divided in two parts, 5150 and 5115065, that added together give a palindrome (5120215).

The spelling of 51505115065 in words is "fifty-one billion, five hundred five million, one hundred fifteen thousand, sixty-five".