51501215111 has 16 divisors (see below), whose sum is σ = 55844976000. Its totient is φ = 47336008608.

The previous prime is 51501215083. The next prime is 51501215113. The reversal of 51501215111 is 11151210515.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51501215111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51501215113) 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, 89801 + ... + 333266.

It is an arithmetic number, because the mean of its divisors is an integer number (3490311000).

Almost surely, 2^51501215111 is an apocalyptic number.

51501215111 is a deficient number, since it is larger than the sum of its proper divisors (4343760889).

51501215111 is a wasteful number, since it uses less digits than its factorization.

51501215111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423278.

The product of its (nonzero) digits is 250, while the sum is 23.

Adding to 51501215111 its reverse (11151210515), we get a palindrome (62652425626).

The spelling of 51501215111 in words is "fifty-one billion, five hundred one million, two hundred fifteen thousand, one hundred eleven".