51565591011 has 16 divisors (see below), whose sum is σ = 75296354688. Its totient is φ = 31130265600.

The previous prime is 51565590931. The next prime is 51565591019. The reversal of 51565591011 is 11019556515.

It is not a de Polignac number, because 51565591011 - 2⁷ = 51565590883 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (51565591019) 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, 3031585 + ... + 3048546.

It is an arithmetic number, because the mean of its divisors is an integer number (4706022168).

Almost surely, 2^51565591011 is an apocalyptic number.

51565591011 is a deficient number, since it is larger than the sum of its proper divisors (23730763677).

51565591011 is a wasteful number, since it uses less digits than its factorization.

51565591011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6080402.

The product of its (nonzero) digits is 33750, while the sum is 39.

The spelling of 51565591011 in words is "fifty-one billion, five hundred sixty-five million, five hundred ninety-one thousand, eleven".