11661055002520 has 256 divisors, whose sum is σ = 33508648166400. Its totient is φ = 3546229800960.

The previous prime is 11661055002517. The next prime is 11661055002533. The reversal of 11661055002520 is 2520055016611.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 122989372 + ... + 123084148.

It is an arithmetic number, because the mean of its divisors is an integer number (130893156900).

Almost surely, 2^{11661055002520} is an apocalyptic number.

11661055002520 is a gapful number since it is divisible by the number (10) 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 11661055002520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16754324083200).

11661055002520 is an abundant number, since it is smaller than the sum of its proper divisors (21847593163880).

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

11661055002520 is a wasteful number, since it uses less digits than its factorization.

11661055002520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95778 (or 95774 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 34.

The spelling of 11661055002520 in words is "eleven trillion, six hundred sixty-one billion, fifty-five million, two thousand, five hundred twenty".