11511055561016 has 64 divisors (see below), whose sum is σ = 24317038080000. Its totient is φ = 5060978755200.

The previous prime is 11511055561003. The next prime is 11511055561079. The reversal of 11511055561016 is 61016555011511.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4397846 + ... + 6508698.

It is an arithmetic number, because the mean of its divisors is an integer number (379953720000).

Almost surely, 2^{11511055561016} 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 11511055561016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12158519040000).

11511055561016 is an abundant number, since it is smaller than the sum of its proper divisors (12805982518984).

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

11511055561016 is a wasteful number, since it uses less digits than its factorization.

11511055561016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112900 (or 2112896 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 38.

The spelling of 11511055561016 in words is "eleven trillion, five hundred eleven billion, fifty-five million, five hundred sixty-one thousand, sixteen".