515666315416 has 128 divisors (see below), whose sum is σ = 1129355136000. Its totient is φ = 216194660352.

The previous prime is 515666315371. The next prime is 515666315447. The reversal of 515666315416 is 614513666515.

It is a self number, because there is not a number n which added to its sum of digits gives 515666315416.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 193931095 + ... + 193933753.

It is an arithmetic number, because the mean of its divisors is an integer number (8823087000).

Almost surely, 2^515666315416 is an apocalyptic number.

515666315416 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 515666315416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (564677568000).

515666315416 is an abundant number, since it is smaller than the sum of its proper divisors (613688820584).

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

515666315416 is a wasteful number, since it uses less digits than its factorization.

515666315416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3161 (or 3157 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 49.

The spelling of 515666315416 in words is "five hundred fifteen billion, six hundred sixty-six million, three hundred fifteen thousand, four hundred sixteen".