51386216920 has 16 divisors (see below), whose sum is σ = 115618988160. Its totient is φ = 20554486752.

The previous prime is 51386216899. The next prime is 51386216929. The reversal of 51386216920 is 2961268315.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51386216929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642327672 + ... + 642327751.

It is an arithmetic number, because the mean of its divisors is an integer number (7226186760).

Almost surely, 2^51386216920 is an apocalyptic number.

It is an amenable number.

51386216920 is an abundant number, since it is smaller than the sum of its proper divisors (64232771240).

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

51386216920 is a wasteful number, since it uses less digits than its factorization.

51386216920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284655434 (or 1284655430 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 51386216920 in words is "fifty-one billion, three hundred eighty-six million, two hundred sixteen thousand, nine hundred twenty".