51185020799 has 8 divisors (see below), whose sum is σ = 55954782720. Its totient is φ = 46434688600.

The previous prime is 51185020787. The next prime is 51185020811. The reversal of 51185020799 is 99702058115.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51185020787) and next prime (51185020811).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51185020799 - 2²⁰ = 51183972223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51185020729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4851917 + ... + 4862454.

It is an arithmetic number, because the mean of its divisors is an integer number (6994347840).

Almost surely, 2^51185020799 is an apocalyptic number.

51185020799 is a deficient number, since it is larger than the sum of its proper divisors (4769761921).

51185020799 is a wasteful number, since it uses less digits than its factorization.

51185020799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9714861.

The product of its (nonzero) digits is 226800, while the sum is 47.

The spelling of 51185020799 in words is "fifty-one billion, one hundred eighty-five million, twenty thousand, seven hundred ninety-nine".