51565611111 has 16 divisors (see below), whose sum is σ = 78579350784. Its totient is φ = 29464870464.

The previous prime is 51565611101. The next prime is 51565611143. The reversal of 51565611111 is 11111656515.

It is not a de Polignac number, because 51565611111 - 2⁹ = 51565610599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51565611101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 934195 + ... + 987851.

It is an arithmetic number, because the mean of its divisors is an integer number (4911209424).

Almost surely, 2^51565611111 is an apocalyptic number.

51565611111 is a deficient number, since it is larger than the sum of its proper divisors (27013739673).

51565611111 is a wasteful number, since it uses less digits than its factorization.

51565611111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99430.

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

The spelling of 51565611111 in words is "fifty-one billion, five hundred sixty-five million, six hundred eleven thousand, one hundred eleven".