51816047268 has 24 divisors (see below), whose sum is σ = 122034058272. Its totient is φ = 17110594624.

The previous prime is 51816047263. The next prime is 51816047299. The reversal of 51816047268 is 86274061815.

It is a super-2 number, since 2×51816047268² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51816047263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20176305 + ... + 20178872.

It is an arithmetic number, because the mean of its divisors is an integer number (5084752428).

Almost surely, 2^51816047268 is an apocalyptic number.

It is an amenable number.

51816047268 is an abundant number, since it is smaller than the sum of its proper divisors (70218011004).

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

51816047268 is a wasteful number, since it uses less digits than its factorization.

51816047268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40355291 (or 40355289 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 51816047268 in words is "fifty-one billion, eight hundred sixteen million, forty-seven thousand, two hundred sixty-eight".