51135752208 has 80 divisors (see below), whose sum is σ = 140644498176. Its totient is φ = 15953909760.

The previous prime is 51135752153. The next prime is 51135752233. The reversal of 51135752208 is 80225753115.

It is a super-2 number, since 2×51135752208² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25416 + ... + 320807.

Almost surely, 2^51135752208 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 51135752208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70322249088).

51135752208 is an abundant number, since it is smaller than the sum of its proper divisors (89508745968).

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

51135752208 is a wasteful number, since it uses less digits than its factorization.

51135752208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346432 (or 346426 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 39.

The spelling of 51135752208 in words is "fifty-one billion, one hundred thirty-five million, seven hundred fifty-two thousand, two hundred eight".