51118665156 has 144 divisors (see below), whose sum is σ = 142295322624. Its totient is φ = 15377983488.

The previous prime is 51118665149. The next prime is 51118665161. The reversal of 51118665156 is 65156681115.

51118665156 is a `hidden beast` number, since 51 + 1 + 1 + 86 + 6 + 515 + 6 = 666.

It is a super-3 number, since 3×51118665156³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3761085 + ... + 3774651.

Almost surely, 2^51118665156 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 51118665156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71147661312).

51118665156 is an abundant number, since it is smaller than the sum of its proper divisors (91176657468).

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

51118665156 is a wasteful number, since it uses less digits than its factorization.

51118665156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13770 (or 13765 counting only the distinct ones).

The product of its digits is 216000, while the sum is 45.

The spelling of 51118665156 in words is "fifty-one billion, one hundred eighteen million, six hundred sixty-five thousand, one hundred fifty-six".