51430749968 has 20 divisors (see below), whose sum is σ = 107312238348. Its totient is φ = 23737269120.

The previous prime is 51430749959. The next prime is 51430750003. The reversal of 51430749968 is 86994703415.

It can be written as a sum of positive squares in 2 ways, for example, as 15622000144 + 35808749824 = 124988^2 + 189232^2 .

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 3 ways as a sum of consecutive naturals, for example, 123631403 + ... + 123631818.

Almost surely, 2^51430749968 is an apocalyptic number.

It is an amenable number.

51430749968 is an abundant number, since it is smaller than the sum of its proper divisors (55881488380).

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

51430749968 is a wasteful number, since it uses less digits than its factorization.

51430749968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247263242 (or 247263236 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 51430749968 in words is "fifty-one billion, four hundred thirty million, seven hundred forty-nine thousand, nine hundred sixty-eight".