51806213073 has 6 divisors (see below), whose sum is σ = 74831196674. Its totient is φ = 34537475376.

The previous prime is 51806213057. The next prime is 51806213099. The reversal of 51806213073 is 37031260815.

51806213073 is a `hidden beast` number, since 518 + 0 + 6 + 2 + 130 + 7 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 50873704704 + 932508369 = 225552^2 + 30537^2 .

It is not a de Polignac number, because 51806213073 - 2⁴ = 51806213057 is a prime.

It is a super-2 number, since 2×51806213073² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51806213033) 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 5 ways as a sum of consecutive naturals, for example, 2878122940 + ... + 2878122957.

Almost surely, 2^51806213073 is an apocalyptic number.

It is an amenable number.

51806213073 is a deficient number, since it is larger than the sum of its proper divisors (23024983601).

51806213073 is a wasteful number, since it uses less digits than its factorization.

51806213073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5756245903 (or 5756245900 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

Adding to 51806213073 its reverse (37031260815), we get a palindrome (88837473888).

It can be divided in two parts, 518062 and 13073, that added together give a palindrome (531135).

The spelling of 51806213073 in words is "fifty-one billion, eight hundred six million, two hundred thirteen thousand, seventy-three".