11515555656066 has 64 divisors (see below), whose sum is σ = 28714494606336. Its totient is φ = 2991013646400.

The previous prime is 11515555656053. The next prime is 11515555656067. The reversal of 11515555656066 is 66065655551511.

It is a junction number, because it is equal to n+sod(n) for n = 11515555655997 and 11515555656015.

It is not an unprimeable number, because it can be changed into a prime (11515555656067) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53189676 + ... + 53405736.

It is an arithmetic number, because the mean of its divisors is an integer number (448663978224).

Almost surely, 2^{11515555656066} is an apocalyptic number.

11515555656066 is an abundant number, since it is smaller than the sum of its proper divisors (17198938950270).

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

11515555656066 is a wasteful number, since it uses less digits than its factorization.

11515555656066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331447.

The product of its (nonzero) digits is 20250000, while the sum is 57.

The spelling of 11515555656066 in words is "eleven trillion, five hundred fifteen billion, five hundred fifty-five million, six hundred fifty-six thousand, sixty-six".