51851438456 has 8 divisors (see below), whose sum is σ = 97221447120. Its totient is φ = 25925719224.

The previous prime is 51851438437. The next prime is 51851438459. The reversal of 51851438456 is 65483415815.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51851438459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3240714896 + ... + 3240714911.

It is an arithmetic number, because the mean of its divisors is an integer number (12152680890).

Almost surely, 2^51851438456 is an apocalyptic number.

It is an amenable number.

51851438456 is a deficient number, since it is larger than the sum of its proper divisors (45370008664).

51851438456 is a wasteful number, since it uses less digits than its factorization.

51851438456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6481429813 (or 6481429809 counting only the distinct ones).

The product of its digits is 2304000, while the sum is 50.

The spelling of 51851438456 in words is "fifty-one billion, eight hundred fifty-one million, four hundred thirty-eight thousand, four hundred fifty-six".