51111989712 has 160 divisors (see below), whose sum is σ = 168795744000. Its totient is φ = 14505288192.

The previous prime is 51111989651. The next prime is 51111989717. The reversal of 51111989712 is 21798911115.

51111989712 is a `hidden beast` number, since 511 + 119 + 8 + 9 + 7 + 12 = 666.

It is a super-2 number, since 2×51111989712² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111989717) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 393858 + ... + 507294.

It is an arithmetic number, because the mean of its divisors is an integer number (1054973400).

Almost surely, 2^51111989712 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 51111989712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84397872000).

51111989712 is an abundant number, since it is smaller than the sum of its proper divisors (117683754288).

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

51111989712 is a wasteful number, since it uses less digits than its factorization.

51111989712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113610 (or 113598 counting only the distinct ones).

The product of its digits is 45360, while the sum is 45.

The spelling of 51111989712 in words is "fifty-one billion, one hundred eleven million, nine hundred eighty-nine thousand, seven hundred twelve".