51111143540 has 48 divisors (see below), whose sum is σ = 107747055360. Its totient is φ = 20365818240.

The previous prime is 51111143497. The next prime is 51111143557. The reversal of 51111143540 is 4534111115.

It is a super-2 number, since 2×51111143540² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 6107399 + ... + 6115761.

It is an arithmetic number, because the mean of its divisors is an integer number (2244730320).

Almost surely, 2^51111143540 is an apocalyptic number.

It is an amenable number.

51111143540 is an abundant number, since it is smaller than the sum of its proper divisors (56635911820).

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

51111143540 is a wasteful number, since it uses less digits than its factorization.

51111143540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9512 (or 9510 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 51111143540 its reverse (4534111115), we get a palindrome (55645254655).

The spelling of 51111143540 in words is "fifty-one billion, one hundred eleven million, one hundred forty-three thousand, five hundred forty".