51278322368 has 224 divisors, whose sum is σ = 139588646400. Its totient is φ = 18087100416.

The previous prime is 51278322353. The next prime is 51278322383. The reversal of 51278322368 is 86322387215.

It is an interprime number because it is at equal distance from previous prime (51278322353) and next prime (51278322383).

It is a tau number, because it is divible by the number of its divisors (224).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1867523 + ... + 1894781.

It is an arithmetic number, because the mean of its divisors is an integer number (623163600).

Almost surely, 2^51278322368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51278322368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69794323200).

51278322368 is an abundant number, since it is smaller than the sum of its proper divisors (88310324032).

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

51278322368 is a wasteful number, since it uses less digits than its factorization.

51278322368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27327 (or 27317 counting only the distinct ones).

The product of its digits is 967680, while the sum is 47.

The spelling of 51278322368 in words is "fifty-one billion, two hundred seventy-eight million, three hundred twenty-two thousand, three hundred sixty-eight".