51430665042 has 20 divisors (see below), whose sum is σ = 115242786846. Its totient is φ = 17143554960.

The previous prime is 51430665037. The next prime is 51430665073. The reversal of 51430665042 is 24056603415.

51430665042 is a `hidden beast` number, since 5 + 143 + 0 + 6 + 6 + 504 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 43668878841 + 7761786201 = 208971^2 + 88101^2 .

It is a super-2 number, since 2×51430665042² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51430664988 and 51430665006.

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 9 ways as a sum of consecutive naturals, for example, 158736459 + ... + 158736782.

Almost surely, 2^51430665042 is an apocalyptic number.

51430665042 is an abundant number, since it is smaller than the sum of its proper divisors (63812121804).

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

51430665042 is a wasteful number, since it uses less digits than its factorization.

51430665042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317473255 (or 317473246 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 51430665042 in words is "fifty-one billion, four hundred thirty million, six hundred sixty-five thousand, forty-two".