51868781966 has 8 divisors (see below), whose sum is σ = 77804388984. Its totient is φ = 25933985640.

The previous prime is 51868781953. The next prime is 51868781969. The reversal of 51868781966 is 66918786815.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51868781969) by changing a digit.

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, 3620 + ... + 322103.

It is an arithmetic number, because the mean of its divisors is an integer number (9725548623).

Almost surely, 2^51868781966 is an apocalyptic number.

51868781966 is a deficient number, since it is larger than the sum of its proper divisors (25935607018).

51868781966 is a wasteful number, since it uses less digits than its factorization.

51868781966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405346.

The product of its digits is 34836480, while the sum is 65.

The spelling of 51868781966 in words is "fifty-one billion, eight hundred sixty-eight million, seven hundred eighty-one thousand, nine hundred sixty-six".