51438358120040 has 64 divisors (see below), whose sum is σ = 120329229888000. Its totient is φ = 19768373349120.

The previous prime is 51438358120007. The next prime is 51438358120063. The reversal of 51438358120040 is 4002185383415.

It is a junction number, because it is equal to n+sod(n) for n = 51438358119973 and 51438358120000.

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 15 ways as a sum of consecutive naturals, for example, 149045435 + ... + 149390154.

It is an arithmetic number, because the mean of its divisors is an integer number (1880144217000).

Almost surely, 2^{51438358120040} is an apocalyptic number.

It is an amenable number.

51438358120040 is an abundant number, since it is smaller than the sum of its proper divisors (68890871767960).

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

51438358120040 is a wasteful number, since it uses less digits than its factorization.

51438358120040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298435770 (or 298435766 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 44.

The spelling of 51438358120040 in words is "fifty-one trillion, four hundred thirty-eight billion, three hundred fifty-eight million, one hundred twenty thousand, forty".