2015128666368 has 432 divisors, whose sum is σ = 6226521100800. Its totient is φ = 625384488960.

The previous prime is 2015128666363. The next prime is 2015128666417. The reversal of 2015128666368 is 8636668215102.

It is a super-2 number, since 2×2015128666368² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2015128666363) 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, 635886288 + ... + 635889456.

Almost surely, 2^{2015128666368} 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 2015128666368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3113260550400).

2015128666368 is an abundant number, since it is smaller than the sum of its proper divisors (4211392434432).

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

2015128666368 is a wasteful number, since it uses less digits than its factorization.

2015128666368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3558 (or 3541 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 2015128666368 in words is "two trillion, fifteen billion, one hundred twenty-eight million, six hundred sixty-six thousand, three hundred sixty-eight".