51005011111 has 8 divisors (see below), whose sum is σ = 53717328000. Its totient is φ = 48295478520.

The previous prime is 51005011063. The next prime is 51005011121. The reversal of 51005011111 is 11111050015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51005011111 - 2⁹ = 51005010599 is a prime.

It is a super-2 number, since 2×51005011111² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51005011121) 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 7 ways as a sum of consecutive naturals, for example, 658411 + ... + 731788.

It is an arithmetic number, because the mean of its divisors is an integer number (6714666000).

Almost surely, 2^51005011111 is an apocalyptic number.

51005011111 is a deficient number, since it is larger than the sum of its proper divisors (2712316889).

51005011111 is a wasteful number, since it uses less digits than its factorization.

51005011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392149.

The product of its (nonzero) digits is 25, while the sum is 16.

Adding to 51005011111 its reverse (11111050015), we get a palindrome (62116061126).

The spelling of 51005011111 in words is "fifty-one billion, five million, eleven thousand, one hundred eleven".