51871044720456 has 192 divisors, whose sum is σ = 154829218864320. Its totient is φ = 15587108328960.

The previous prime is 51871044720431. The next prime is 51871044720457. The reversal of 51871044720456 is 65402744017815.

It is a happy number.

51871044720456 is a `hidden beast` number, since 5 + 1 + 87 + 1 + 0 + 44 + 72 + 0 + 456 = 666.

It is not an unprimeable number, because it can be changed into a prime (51871044720457) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 322346290 + ... + 322507166.

It is an arithmetic number, because the mean of its divisors is an integer number (806402181585).

Almost surely, 2^{51871044720456} 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 51871044720456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77414609432160).

51871044720456 is an abundant number, since it is smaller than the sum of its proper divisors (102958174143864).

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

51871044720456 is a wasteful number, since it uses less digits than its factorization.

51871044720456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168956 (or 168949 counting only the distinct ones).

The product of its (nonzero) digits is 7526400, while the sum is 54.

The spelling of 51871044720456 in words is "fifty-one trillion, eight hundred seventy-one billion, forty-four million, seven hundred twenty thousand, four hundred fifty-six".