51613381248 has 512 divisors, whose sum is σ = 166561920000. Its totient is φ = 13954744320.

The previous prime is 51613381217. The next prime is 51613381271. The reversal of 51613381248 is 84218331615.

It is a happy number.

It is a super-2 number, since 2×51613381248² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 288342823 + ... + 288343001.

It is an arithmetic number, because the mean of its divisors is an integer number (325316250).

Almost surely, 2^51613381248 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 51613381248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83280960000).

51613381248 is an abundant number, since it is smaller than the sum of its proper divisors (114948538752).

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

51613381248 is a wasteful number, since it uses less digits than its factorization.

51613381248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 356 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The spelling of 51613381248 in words is "fifty-one billion, six hundred thirteen million, three hundred eighty-one thousand, two hundred forty-eight".