51111116565 has 16 divisors (see below), whose sum is σ = 81783457728. Its totient is φ = 27257371776.

The previous prime is 51111116543. The next prime is 51111116593. The reversal of 51111116565 is 56561111115.

It is not a de Polignac number, because 51111116565 - 2⁶ = 51111116501 is a prime.

It is a super-2 number, since 2×51111116565² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 120969 + ... + 341841.

It is an arithmetic number, because the mean of its divisors is an integer number (5111466108).

Almost surely, 2^51111116565 is an apocalyptic number.

It is an amenable number.

51111116565 is a deficient number, since it is larger than the sum of its proper divisors (30672341163).

51111116565 is a wasteful number, since it uses less digits than its factorization.

51111116565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236308.

The product of its digits is 4500, while the sum is 33.

The spelling of 51111116565 in words is "fifty-one billion, one hundred eleven million, one hundred sixteen thousand, five hundred sixty-five".