51393738984 has 192 divisors, whose sum is σ = 154867723200. Its totient is φ = 14154448896.

The previous prime is 51393738983. The next prime is 51393739003. The reversal of 51393738984 is 48983739315.

It is a super-5 number, since 5×51393738984⁵ (a number of 55 digits) contains 55555 as substring.

It is not an unprimeable number, because it can be changed into a prime (51393738983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39321259 + ... + 39322565.

It is an arithmetic number, because the mean of its divisors is an integer number (806602725).

Almost surely, 2^51393738984 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 51393738984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77433861600).

51393738984 is an abundant number, since it is smaller than the sum of its proper divisors (103473984216).

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

51393738984 is a wasteful number, since it uses less digits than its factorization.

51393738984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512 (or 2501 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 60.

The spelling of 51393738984 in words is "fifty-one billion, three hundred ninety-three million, seven hundred thirty-eight thousand, nine hundred eighty-four".