11665511556061 has 16 divisors (see below), whose sum is σ = 12747690676800. Its totient is φ = 10586947950720.

The previous prime is 11665511556043. The next prime is 11665511556089. The reversal of 11665511556061 is 16065511556611.

11665511556061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11665511556061 - 2⁵ = 11665511556029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11665511555996 and 11665511556014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11665511556011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107314465 + ... + 107423113.

It is an arithmetic number, because the mean of its divisors is an integer number (796730667300).

Almost surely, 2^{11665511556061} is an apocalyptic number.

11665511556061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11665511556061 is a deficient number, since it is larger than the sum of its proper divisors (1082179120739).

11665511556061 is a wasteful number, since it uses less digits than its factorization.

11665511556061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125196.

The product of its (nonzero) digits is 810000, while the sum is 49.

The spelling of 11665511556061 in words is "eleven trillion, six hundred sixty-five billion, five hundred eleven million, five hundred fifty-six thousand, sixty-one".