516721438872 has 96 divisors (see below), whose sum is σ = 1445318784000. Its totient is φ = 166601119680.

The previous prime is 516721438861. The next prime is 516721438927. The reversal of 516721438872 is 278834127615.

516721438872 is a `hidden beast` number, since 51 + 67 + 21 + 438 + 87 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4494279 + ... + 4607817.

It is an arithmetic number, because the mean of its divisors is an integer number (15055404000).

Almost surely, 2^516721438872 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 516721438872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (722659392000).

516721438872 is an abundant number, since it is smaller than the sum of its proper divisors (928597345128).

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

516721438872 is a wasteful number, since it uses less digits than its factorization.

516721438872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115621 (or 115614 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The spelling of 516721438872 in words is "five hundred sixteen billion, seven hundred twenty-one million, four hundred thirty-eight thousand, eight hundred seventy-two".