51865379807040 has 84 divisors (see below), whose sum is σ = 178395295971204. Its totient is φ = 13830767947776.

The previous prime is 51865379807009. The next prime is 51865379807057. The reversal of 51865379807040 is 4070897356815.

51865379807040 is a `hidden beast` number, since 5 + 1 + 8 + 6 + 537 + 98 + 0 + 7 + 0 + 4 + 0 = 666.

51865379807040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 5624182999296 + 46241196807744 = 2371536^2 + 6800088^2 .

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 9004403337 + ... + 9004409096.

Almost surely, 2^{51865379807040} is an apocalyptic number.

It is an amenable number.

51865379807040 is an abundant number, since it is smaller than the sum of its proper divisors (126529916164164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51865379807040 is a wasteful number, since it uses less digits than its factorization.

51865379807040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18008812456 (or 18008812443 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 63.

The spelling of 51865379807040 in words is "fifty-one trillion, eight hundred sixty-five billion, three hundred seventy-nine million, eight hundred seven thousand, forty".