51382443861 has 96 divisors (see below), whose sum is σ = 89766144000. Its totient is φ = 27702347904.

The previous prime is 51382443857. The next prime is 51382443901. The reversal of 51382443861 is 16834428315.

51382443861 is a `hidden beast` number, since 5 + 138 + 24 + 438 + 61 = 666.

It is not a de Polignac number, because 51382443861 - 2² = 51382443857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51382443821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 19293616 + ... + 19296278.

It is an arithmetic number, because the mean of its divisors is an integer number (935064000).

Almost surely, 2^51382443861 is an apocalyptic number.

It is an amenable number.

51382443861 is a deficient number, since it is larger than the sum of its proper divisors (38383700139).

51382443861 is a wasteful number, since it uses less digits than its factorization.

51382443861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2943 (or 2940 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The spelling of 51382443861 in words is "fifty-one billion, three hundred eighty-two million, four hundred forty-three thousand, eight hundred sixty-one".