51942069785 has 8 divisors (see below), whose sum is σ = 62331784200. Its totient is φ = 41552788864.

The previous prime is 51942069779. The next prime is 51942069799. The reversal of 51942069785 is 58796024915.

It can be written as a sum of positive squares in 4 ways, for example, as 29637136 + 51912432649 = 5444^2 + 227843^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51942069785 - 2¹⁶ = 51942004249 is a prime.

It is a super-2 number, since 2×51942069785² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51942069785.

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 7 ways as a sum of consecutive naturals, for example, 285149 + ... + 430341.

It is an arithmetic number, because the mean of its divisors is an integer number (7791473025).

Almost surely, 2^51942069785 is an apocalyptic number.

It is an amenable number.

51942069785 is a deficient number, since it is larger than the sum of its proper divisors (10389714415).

51942069785 is a wasteful number, since it uses less digits than its factorization.

51942069785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216747.

The product of its (nonzero) digits is 5443200, while the sum is 56.

The spelling of 51942069785 in words is "fifty-one billion, nine hundred forty-two million, sixty-nine thousand, seven hundred eighty-five".