51166515616256 has 80 divisors (see below), whose sum is σ = 103839984589440. Its totient is φ = 25183100067840.

The previous prime is 51166515616211. The next prime is 51166515616309. The reversal of 51166515616256 is 65261651566115.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11477420 + ... + 15299156.

It is an arithmetic number, because the mean of its divisors is an integer number (1297999807368).

Almost surely, 2^{51166515616256} 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 51166515616256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51919992294720).

51166515616256 is an abundant number, since it is smaller than the sum of its proper divisors (52673468973184).

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

51166515616256 is an equidigital number, since it uses as much as digits as its factorization.

51166515616256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3822165 (or 3822149 counting only the distinct ones).

The product of its digits is 9720000, while the sum is 56.

The spelling of 51166515616256 in words is "fifty-one trillion, one hundred sixty-six billion, five hundred fifteen million, six hundred sixteen thousand, two hundred fifty-six".