51111112512 has 28 divisors (see below), whose sum is σ = 135231485696. Its totient is φ = 17037037440.

The previous prime is 51111112477. The next prime is 51111112517. The reversal of 51111112512 is 21521111115.

It is a super-2 number, since 2×51111112512² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111112517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133101664 + ... + 133102047.

Almost surely, 2^51111112512 is an apocalyptic number.

It is an amenable number.

51111112512 is an abundant number, since it is smaller than the sum of its proper divisors (84120373184).

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

51111112512 is a wasteful number, since it uses less digits than its factorization.

51111112512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266203726 (or 266203716 counting only the distinct ones).

The product of its digits is 100, while the sum is 21.

Adding to 51111112512 its reverse (21521111115), we get a palindrome (72632223627).

The spelling of 51111112512 in words is "fifty-one billion, one hundred eleven million, one hundred twelve thousand, five hundred twelve".