51181637516 has 12 divisors (see below), whose sum is σ = 89767351800. Its totient is φ = 25533822720.

The previous prime is 51181637509. The next prime is 51181637519. The reversal of 51181637516 is 61573618115.

It is not an unprimeable number, because it can be changed into a prime (51181637519) 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, 14246990 + ... + 14250581.

It is an arithmetic number, because the mean of its divisors is an integer number (7480612650).

Almost surely, 2^51181637516 is an apocalyptic number.

It is an amenable number.

51181637516 is a deficient number, since it is larger than the sum of its proper divisors (38585714284).

51181637516 is a wasteful number, since it uses less digits than its factorization.

51181637516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28498024 (or 28498022 counting only the distinct ones).

The product of its digits is 151200, while the sum is 44.

The spelling of 51181637516 in words is "fifty-one billion, one hundred eighty-one million, six hundred thirty-seven thousand, five hundred sixteen".