51111310020 has 192 divisors, whose sum is σ = 147818151936. Its totient is φ = 13189962240.

The previous prime is 51111310013. The next prime is 51111310039. The reversal of 51111310020 is 2001311115.

It is a super-2 number, since 2×51111310020² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

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 63 ways as a sum of consecutive naturals, for example, 109445827 + ... + 109446293.

It is an arithmetic number, because the mean of its divisors is an integer number (769886208).

Almost surely, 2^51111310020 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 51111310020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73909075968).

51111310020 is an abundant number, since it is smaller than the sum of its proper divisors (96706841916).

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

51111310020 is a wasteful number, since it uses less digits than its factorization.

51111310020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930 (or 928 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 15.

Adding to 51111310020 its reverse (2001311115), we get a palindrome (53112621135).

It can be divided in two parts, 5111 and 1310020, that added together give a palindrome (1315131).

The spelling of 51111310020 in words is "fifty-one billion, one hundred eleven million, three hundred ten thousand, twenty".