51855489365 has 8 divisors (see below), whose sum is σ = 62498320440. Its totient is φ = 41303236032.

The previous prime is 51855489331. The next prime is 51855489373. The reversal of 51855489365 is 56398455815.

It can be written as a sum of positive squares in 4 ways, for example, as 12921096241 + 38934393124 = 113671^2 + 197318^2 .

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 51855489365 - 2²⁰ = 51854440789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22643174 + ... + 22645463.

It is an arithmetic number, because the mean of its divisors is an integer number (7812290055).

Almost surely, 2^51855489365 is an apocalyptic number.

It is an amenable number.

51855489365 is a deficient number, since it is larger than the sum of its proper divisors (10642831075).

51855489365 is a wasteful number, since it uses less digits than its factorization.

51855489365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45288871.

The product of its digits is 25920000, while the sum is 59.

The spelling of 51855489365 in words is "fifty-one billion, eight hundred fifty-five million, four hundred eighty-nine thousand, three hundred sixty-five".