51121365833 has 4 divisors (see below), whose sum is σ = 51254842368. Its totient is φ = 50987889300.

The previous prime is 51121365809. The next prime is 51121365853. The reversal of 51121365833 is 33856312115.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33856312115 = 5 ⋅6771262423.

It is a cyclic number.

It is not a de Polignac number, because 51121365833 - 2⁶ = 51121365769 is a prime.

It is a super-2 number, since 2×51121365833² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51121365803) 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 3 ways as a sum of consecutive naturals, for example, 66737693 + ... + 66738458.

It is an arithmetic number, because the mean of its divisors is an integer number (12813710592).

Almost surely, 2^51121365833 is an apocalyptic number.

It is an amenable number.

51121365833 is a deficient number, since it is larger than the sum of its proper divisors (133476535).

51121365833 is a wasteful number, since it uses less digits than its factorization.

51121365833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133476534.

The product of its digits is 64800, while the sum is 38.

Adding to 51121365833 its reverse (33856312115), we get a palindrome (84977677948).

The spelling of 51121365833 in words is "fifty-one billion, one hundred twenty-one million, three hundred sixty-five thousand, eight hundred thirty-three".