51871366656 has 160 divisors (see below), whose sum is σ = 153728092320. Its totient is φ = 17269604352.

The previous prime is 51871366649. The next prime is 51871366667. The reversal of 51871366656 is 65666317815.

It is a super-2 number, since 2×51871366656² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15107916 + ... + 15111348.

It is an arithmetic number, because the mean of its divisors is an integer number (960800577).

Almost surely, 2^51871366656 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 51871366656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76864046160).

51871366656 is an abundant number, since it is smaller than the sum of its proper divisors (101856725664).

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

51871366656 is a wasteful number, since it uses less digits than its factorization.

51871366656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4553 (or 4531 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 51871366656 in words is "fifty-one billion, eight hundred seventy-one million, three hundred sixty-six thousand, six hundred fifty-six".