51660582163216 has 80 divisors (see below), whose sum is σ = 108280758431664. Its totient is φ = 23735236902912.

The previous prime is 51660582163213. The next prime is 51660582163217. The reversal of 51660582163216 is 61236128506615.

It can be written as a sum of positive squares in 8 ways, for example, as 9014405760000 + 42646176403216 = 3002400^2 + 6530404^2 .

It is a super-2 number, since 2×51660582163216² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (51660582163213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202306530 + ... + 202561726.

Almost surely, 2^{51660582163216} 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 51660582163216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54140379215832).

51660582163216 is an abundant number, since it is smaller than the sum of its proper divisors (56620176268448).

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

51660582163216 is a wasteful number, since it uses less digits than its factorization.

51660582163216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259628 (or 259622 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 52.

The spelling of 51660582163216 in words is "fifty-one trillion, six hundred sixty billion, five hundred eighty-two million, one hundred sixty-three thousand, two hundred sixteen".