51863651269 has 8 divisors (see below), whose sum is σ = 51933126168. Its totient is φ = 51794211840.

The previous prime is 51863651267. The next prime is 51863651297. The reversal of 51863651269 is 96215636815.

It can be written as a sum of positive squares in 4 ways, for example, as 46877879169 + 4985772100 = 216513^2 + 70610^2 .

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 51863651269 - 2¹ = 51863651267 is a prime.

It is a super-2 number, since 2×51863651269² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51863651263) 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, 4137199 + ... + 4149715.

It is an arithmetic number, because the mean of its divisors is an integer number (6491640771).

Almost surely, 2^51863651269 is an apocalyptic number.

It is an amenable number.

51863651269 is a deficient number, since it is larger than the sum of its proper divisors (69474899).

51863651269 is a wasteful number, since it uses less digits than its factorization.

51863651269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17735.

The product of its digits is 2332800, while the sum is 52.

The spelling of 51863651269 in words is "fifty-one billion, eight hundred sixty-three million, six hundred fifty-one thousand, two hundred sixty-nine".