2155513015530 has 128 divisors (see below), whose sum is σ = 6574310092800. Its totient is φ = 492304122432.

The previous prime is 2155513015501. The next prime is 2155513015549. The reversal of 2155513015530 is 355103155512.

2155513015530 is a `hidden beast` number, since 2 + 1 + 55 + 51 + 3 + 0 + 1 + 553 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1980411 + ... + 2869329.

It is an arithmetic number, because the mean of its divisors is an integer number (51361797600).

Almost surely, 2^{2155513015530} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155513015530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3287155046400).

2155513015530 is an abundant number, since it is smaller than the sum of its proper divisors (4418797077270).

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

2155513015530 is a wasteful number, since it uses less digits than its factorization.

2155513015530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890225 (or 890219 counting only the distinct ones).

The product of its (nonzero) digits is 56250, while the sum is 36.

The spelling of 2155513015530 in words is "two trillion, one hundred fifty-five billion, five hundred thirteen million, fifteen thousand, five hundred thirty".