51101115012 has 18 divisors (see below), whose sum is σ = 129172263038. Its totient is φ = 17033704992.

The previous prime is 51101115001. The next prime is 51101115061. The reversal of 51101115012 is 21051110115.

51101115012 is a `hidden beast` number, since 51 + 1 + 0 + 111 + 501 + 2 = 666.

51101115012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 28427983236 + 22673131776 = 168606^2 + 150576^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×51101115012² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 709737673 + ... + 709737744.

Almost surely, 2^51101115012 is an apocalyptic number.

It is an amenable number.

51101115012 is an abundant number, since it is smaller than the sum of its proper divisors (78071148026).

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

51101115012 is a wasteful number, since it uses less digits than its factorization.

51101115012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419475427 (or 1419475422 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 18.

Adding to 51101115012 its reverse (21051110115), we get a palindrome (72152225127).

The spelling of 51101115012 in words is "fifty-one billion, one hundred one million, one hundred fifteen thousand, twelve".