51505660115556 has 192 divisors, whose sum is σ = 129050335814400. Its totient is φ = 15956862437376.

The previous prime is 51505660115489. The next prime is 51505660115563. The reversal of 51505660115556 is 65551106650515.

It is a super-2 number, since 2×51505660115556² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51505660115499 and 51505660115508.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 453989670 + ... + 454103106.

It is an arithmetic number, because the mean of its divisors is an integer number (672137165700).

Almost surely, 2^{51505660115556} 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 51505660115556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64525167907200).

51505660115556 is an abundant number, since it is smaller than the sum of its proper divisors (77544675698844).

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

51505660115556 is a wasteful number, since it uses less digits than its factorization.

51505660115556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113886 (or 113884 counting only the distinct ones).

The product of its (nonzero) digits is 3375000, while the sum is 51.

The spelling of 51505660115556 in words is "fifty-one trillion, five hundred five billion, six hundred sixty million, one hundred fifteen thousand, five hundred fifty-six".